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a born-digital, open-review volume edited by Jack Dougherty and Kristen Nawrotzki

Putting Harlem on the Map (2012 revision)

Permalink for this paragraph 0 Beginning in 1904, black New Yorkers relocated their residences, churches and businesses to the streets around the new subway station at 135th Street and Lenox Avenue in Harlem. Waves of African American migrants from the South and immigrants from the Caribbean joined them, creating a community in which blacks resided segregated from whites. By 1920 the area occupied almost exclusively by blacks stretched south to 130th Street, north to 144th Street, from Fifth Avenue across to Eighth Avenue, and encompassed a population of some 73,000 people. In the next decade Harlem became the “Negro Mecca,” a more cosmopolitan place than America’s other “black metropolis,” Chicago, one deserving of the title of the world’s black capital. By 1930, blacks, now numbering around 200,000, had spilled over Eighth Avenue to Amsterdam Avenue, and were living as far north as 160th Street, and approaching 110th Street to the south. But, of course, it was about more than simply size or numbers. Harlem was home to the political and cultural leaders of black America: the New York Urban League and Garvey’s United Negro Improvement Association (UNIA) had their headquarters there; writers Langston Hughes, Wallace Thurman, and Zora Neale Hurston all lodged in the same building; and Duke Ellington and Ethel Waters performed in the neighborhood’s clubs and theatres.1

Permalink for this paragraph 0 That picture of Harlem is in line with those you would find setting the scene for most studies of the neighborhood, or offering a snapshot in some broader account. After six years of using digital geospatial tools to study Harlem, I’m struck by how much it omits, and how little sense of the place it conveys. If urban history is defined by a concern with particular places and spaces, it has long been satisfied with a large scale or very selective treatment of physical locations. Certainly, when three colleagues and I conceived a collaborative study of everyday life in Harlem in the 1920s, we largely took the place as a given. Our central concern was to identify ordinary blacks, residents other than those familiar from the ever-expanding literature on the Harlem Renaissance and the beginnings of the civil rights movement. In fact, only when we headed to the archives did we even confront having to precisely define the neighborhood’s boundaries.2

Permalink for this paragraph 0 The digital tools we used to manage what we found in the archives changed how I thought about Harlem. Our core sources consisted of almost three thousand case files containing accounts of crimes by or involving blacks, and hundreds of pages of black newspapers. I had used a simple FileMaker database to organize similar material in a previous project, and had proposed we develop a more sophisticated online database for this material, so all the collaborators could share and use it. In addition, since our research concerned a neighborhood, and legal records almost invariably include information on locations, I envisioned that database as linked to maps. Geographic Information Systems (GIS) offered that combination of a database and a mapping system, and with only a general idea of how such software worked and what it could do, I imagined using it to recreate several key blocks in Harlem. It was 2002, when the existing historical GIS projects employed desktop ArcGIS software developed for social scientists, relied on quantitative data and could not easily be shared online.3  However, the designers and programmers who we employed, from the University of Sydney’s Archaeological Computing Laboratory (now Arts eResearch), offered us a different approach. When they constructed our database, in 2006, as a temporary fix they linked it to Google Maps, made available online only a year earlier, to allow me to create preliminary maps of our evidence. As we grappled with a raft of design and technical challenges, it became clear that this simplified, web-based form of GIS would serve the purposes of the project, and Digital Harlem became one of the first scholarly sites to employ what has become known as the geospatial web.4

Permalink for this paragraph 0 GIS organizes and integrates sources on the basis of their shared geographic location, which in the case of an urban setting means their street address. Working with addresses involved thinking about Harlem on a much smaller scale than had other scholars.5 Maps in existing historical studies focused on showing the boundaries of the area dominated by black residents and the location of a handful of landmarks, at a scale that located Harlem in upper Manhattan, the area above Central Park. With a street map as the background, the area around the boundaries and landmarks appeared only as undifferentiated space.6 To fill the spaces in these maps, to recreate Harlem at the scale of individual addresses, I turned to a real estate atlas from 1930, from which the ACL eventually created a map to overlay on Google Maps. Real estate maps include the footprints of buildings, with information on how many floors high they stood, on the materials from which they were constructed, and on the presence of elevators and stores.7  In other words, these maps literally fill in the blocks of the street map, helping, as Ian Gregory and Paul Ell put it, to “subdivide the place under study into multiple smaller places and give some indication of how these places interact.”8 Thinking about Harlem at this scale, you are immediately confronted with how imprecisely most historical scholarship treats location: events and buildings are not given an address, or given only a partial or incorrect address, and little attention is paid to how that location is related to other places, to what is proximate or distant. It is enough to say that the places mentioned are somewhere in Harlem.

Figure 1: Detail from Atlas of the City of New York, Borough of Manhattan, Vol. 4 (G. W. Bromley & Co., 1932), Digital Harlem, accessed August 10, 2011 http://acl.arts.usyd.edu.au/harlem/

Permalink for this paragraph 0 Examining Harlem at a smaller scale involved me in what Karen Halttunen identified as the second wave of the spatial turn in humanities scholarship, the move from constructing a spatial analysis that “tended to the metaphorical” and employed the “idiom of borders and boundaries, frontiers and crossroads, centers and margins,” to a concern with “spatial issues more materially.”9 While you could argue that my work is spatial history not digital history, this would ignore the extent to which such mapping is not just enabled by digital tools, but really only possible when you use such tools. Real estate maps are so small in scale that they cannot be reproduced in print publications, with those covering Harlem amounting to almost an entire atlas volume. However, digitized and overlaid on Google Maps, real estate maps become scalable, making it possible to zoom out from individual buildings to the neighborhood view favored in historical maps of Harlem, and to an even larger scale that situates upper Manhattan in the larger city.

Figure 2: Real Estate Map Overlay, Digital Harlem, accessed August 10, 2011, http://acl.arts.usyd.edu.au/harlem/

Permalink for this paragraph 0 Geospatial tools involve not only maps but also databases. The power of such tools is that they use geographic location to integrate material from a wide range of disparate sources. “What is important about assigning a geographic reference to data,” Karen Kemp points out, “is that it then becomes possible to compare that characteristic, event, phenomenon, etc. with others that exist or have existed in the same geographic space. What were previously unrelated facts become integrated and correlated.”10 The sources that feature in Digital Harlem are qualitative records rather than the quantitative data traditionally used in GIS. Few other attempts have been made to use the technology to analyze such sources. The most prominent example is Valley of the Shadow, which maps railroads and roads, agricultural production and farm values, households owning slaves, voting and the location of churches, in order to compare two communities in the era of the Civil War.11

Figure 3: Database Search Results, Event Type=”Automobile Crash”

Permalink for this paragraph 0 What distinguishes Digital Harlem from The Valley of the Shadow is not only its sources–legal records and newspapers–but also that the database contains everything in the sources that is associated with an address. The geospatial database allowed us to incorporate and organize a range of material that historians typically treat as ephemera, or pass over it as too sparse or fragmentary to support an analysis. From the newspapers, we took not just the news stories on which scholars typically focus, but also the society columns, sports reports, news from churches and fraternal organizations, and advertisements. From the legal records, we took every offense, not just a particular crime or group of crimes, and information on the victim and witnesses as well as the offender, on the nature of the crime’s location, and on the circumstances in which it occurred, which ranged from card games to shopping trips. The range of activity captured by Digital Harlem can be seen in the list of event types in the database (figure 4). (Crimes constitute a minority of the events in the database, but are prominent in that list because the variety of different offenses in the law effectively disaggregates crime more than the categories we have used for other events). Recurrent events such as plays, movies, church services, and street speakers are not included as event types but instead can be located by searching by location type for their venues. At the same time, the need for a location excluded some material; every newspaper issue included some stories that did not include an address, and therefore could not be included in the database. So, as much as the database offered a way to bring together a wide range of material, it was not a means of creating a ‘total history,’ an all-encompassing picture of everyday life.

Figure 4: Event Types

Permalink for this paragraph 0 In making it possible to place the contents of a database on an online map, GIS takes advantage of one of the core properties of the digital medium, that it is visual, an aspect that historians have been slow to develop, exploit and make integral to historical analysis.12 As Trevor Harris, Jesse Rouse and Susan Bergeron argue, “The visual display of information creates a visceral connection to the content that goes beyond what is possible through traditional text documents.”13 (That contrast is evident in a comparison of how traffic accidents appear in the database (figure 3) and displayed on the map (figure 6)). It is not just that mapped data is seen in its geographical context. Layers of different data, and hence large quantities of data, can be combined on a single map, providing an image of the complexity of the past.  You can examine maps of sources at different scales, and “discover relationships…by visually detecting spatial patterns that remain hidden in texts and tables.”14 Those spatial relationships prompted questions I might otherwise have ignored and facilitated comparisons that I would not have considered. But there are definite limits to the visualizations created by Digital Harlem, and GIS in general. As Ian Gregory notes, “They provide a simple summary of the distribution of a variable in ways that attempt to stress the spatial by simplifying attribute [the characteristics recorded about entities in the database] and fixing time.”15 The patterns evident on these maps reveal “where,” in the process asking, but not explaining, “why there?”. Nonetheless, pursuing answers to such questions changed the way I thought about Harlem’s past, and gave me a different perspective on the neighborhood.

Figure 5: Nightclubs, Speakeasies and Buffet Flats (Search Places, Location Type=”Nightclub” + Location Type=”Speakeasy” + Location Type=”Buffet Flat”, Digital Harlem, accessed August 10, 2011, http://acl.arts.usyd.edu.au/harlem/)

Permalink for this paragraph 0 One example of the new perspective Digital Harlem offers is this map of Harlem’s nightlife, which includes layers showing the neighborhood’s nightclubs, the speakeasies that became ubiquitous during Prohibition, and the buffet flats black residents set up as an alternative to those venues. The nightclubs are the most familiar of Harlem’s attractions, described in a range of sources. The presence of speakeasies is also well known, but they and their locations are discussed only in general terms. This map uses lists of locations regularly published in the New York Age as part of the editor’s efforts to get Prohibition authorities to take action. The third venue, buffet flats operated in residences, attract only a passing mention by scholars, but they became a concern for reformers at the end of the 1920s, and in 1928, the target of an undercover investigation by the Committee of Fourteen, a white anti-prostitution organization. Combining these sources shows that these nightlife venues had very different geographies. Nightclubs, many of which predated Prohibition, clustered around 135th Street and on and east of Seventh Avenue, locations that stretched from the core of black settlement toward the areas of white population. Speakeasies could be found far more widely throughout Harlem, mostly on the avenues, in storefronts, including on Eighth Avenue, which had no other nightlife, with clusters in the vicinity of nightclubs. Buffet flats likewise operated at more widely scattered locations than nightclubs, but most were on cross streets, not avenues, with many above 140th Street, a largely residential district distant from whites. Whereas whites owned most nightclubs and speakeasies, and catered to white or racially mixed crowds, blacks operated the buffet flats for black patrons, without publicizing their locations, thereby extending some of the privacy of a residence to their customers. Mapping nightlife thus helps identify an unrecognized black response to Prohibition’s impact on Harlem: the creation of places apart from the whites who appeared in increasing numbers in the neighborhood’s nightlife.16

Figure 6: Traffic Accidents (Search Events, Type of Event=”Automobile crash,” Digital Harlem, accessed August 10, 2011, http://acl.arts.usyd.edu.au/harlem/)

Permalink for this paragraph 0 Traffic accidents offer another example of how Digital Harlem changed how I thought. In the first instance, I would not have paid attention to these incidents if I had not been entering every event that had a location into the database.  Reports of accidents appeared regularly in black newspapers, but usually amounted to no more than a few sentences. A map of that information (figure 6) showed accidents throughout the neighborhood, concentrated on Seventh and Lenox Avenues, which ran north-south the length of Harlem.  These avenues have long been recognized as occupying a central place in Harlem life.  Christened the “Black Broadway” by writer Wallace Thurman, Seventh Avenue featured the nightlife visited by thousands each evening in the late 1920s, and many of Harlem’s major churches, which drew large crowds each Sunday. On the sidewalks of both avenues, individuals went “strolling,” donning their best clothes took to display their style, to socialize with friends and to meet strangers. Men and women collecting bets on the numbers occupied the corners each weekday morning, replaced in the evenings by prostitutes. On weekends, residents paraded in the avenues themselves, with their fraternal lodges, as members of the UNIA or in funeral processions.17 However, in addition to these well-known activities, the two avenues saw more traffic than any other roadway north of 59th Street, most of it travelling through the neighborhood en route into and out of the city, joined in the evening by fleets of taxis bringing visitors to Harlem’s nightlife. Public transport also ran on both avenues: street cars travelled on Lenox from 116th to 148th Street, and double-decker buses ran on Seventh from 110th to 155th Street.

Permalink for this paragraph 0 Accidents revealed an overlooked facet of life in the neighborhood, and recast the context and meaning of what happened on the avenues. Whites made up most of those driving on Harlem’s streets, behind the wheel of private cars, buses and streetcars. As a result, traffic accidents often produced interracial encounters, conflict and occasionally violence. Efforts to better control the traffic in some cases exacerbated that conflict. The traffic police eventually stationed at the most dangerous intersections included black officers, whose direction of white drivers often attracted crowds of blacks, and enough controversy that the Police Department refused to appoint them to posts on 125th Street, where many pedestrians as well as drivers would have been white.18 In the context of the white presence in the street and the white ownership of the businesses lining the avenues, when blacks paraded, strolled the sidewalks and spoke on the street corners they effectively contested white dominance of the avenues and claimed those places for themselves. That such racial contests for space took place within Harlem made me pay more attention to the white places in what I had thought of as simply a black neighborhood. Not only did there prove to be a more extensive white presence than the passing mentions in the historiography implied, but, as I argue in a forthcoming article, it was more contentious, introducing the racial negotiation, resistance, and accommodation that characterized the rest of the city into some places in Harlem itself, taking away from the respite that the neighborhood offered blacks.19

Figure 7: An Individual Life: Morgan Thompson (Search People, First Name=“Morgan” and Surname=”Thompson”, Digital Harlem, accessed August 11, 2011, http://acl.arts.usyd.edu.au/harlem/)

Permalink for this paragraph 0 While mapping traffic accidents made me aware of the white presence in Harlem, visualizing the lives of individuals gave me a new sense of how blacks moved around the neighborhood and the wider city. Digital Harlem uses lines to mark two kinds of temporal relations, to link sequences of locations at which events like parades took place, and to link an individual’s residence with locations where she or he spent time while living at that address.20 The richest pictures of individual lives are contained in Probation Department files, whose subjects reported their activities on a weekly basis for up to five years. Maps of their lives highlight the distance they had to travel to work, and how often many changed their residence. Morgan Thompson, a West Indian on probation after he lost his temper and stabbed a man who had confronted his seventeen-year-old son, worked as a laborer for construction contractors. Between 1928 and 1933 that work took him to fifteen different construction sites, in downtown Manhattan and on the Upper East Side, and in the outer boroughs of Brooklyn, Queens and the Bronx. Only once did he work in Harlem, on the new 135th Street YMCA (figure 6).21 Maps also identify other largely unexplored occasions when blacks had to move through the city, including to attend sporting events. While basketball games took place in Harlem’s dancehalls and church community houses, cricket and baseball games involving black teams took place in Washington Heights, the Bronx and Brooklyn.22

Permalink for this paragraph 0 Within Harlem, while Morgan Thompson and his family lived at the same address on West 144th Street for over a decade, many black families regularly relocated. Perry Brown, a forty-five year old on probation for stealing coats to pay for his wife’s medical care, relocated five times in three years, not simply to get better housing but sometimes to get rooms to lease to boarders, or premises easier for his wife to maintain, or when he could not pay the rent.23 The variety of apartments Brown and his wife occupied highlights the range of housing that existed in Harlem beyond the overcrowded tenements and middle-class dwellings that typically draw attention. Moreover, for all the upheaval attending relocation, mapping the Browns’ homes highlights that for Harlemites moving generally only involved shifting a few blocks, with little likely disruption of their relationships and involvement in the community.

Permalink for this paragraph 0 Working with Digital Harlem also led me to write in a different form, a blog.24 This online writing is typically seen primarily in terms of length, as a short form, but what shaped my blogging was its relationship to other forms of digital history and historical writing. In the first instance, blogging provided a way to supplement Digital Harlem. As the maps created on the site by their very nature raise questions rather than answering them, they could not simply stand on their own online. Digital Harlem required additional context; a blog provided a medium linked to the site in which to tell stories about the maps. In addition, Digital Harlem’s maps are difficult to incorporate into print publications: dynamic maps have to become static, without scalability or links to the database of sources; and colored visualizations have to be reproduced in black and white, limiting the layers and quantity of data that can be included. Included in a blog, screenshots of the maps retain their color and can be linked to the site. They also can be supplemented with images, which are not currently in the database and for which space is limited in print publications. The blog posts thus can also provide a form of footnote to traditional published writing, where I can elaborate in more detail a topic that there is only space to touch on in a print article. Relative to a published footnote, the blog is a longer form. Obviously, online the blog can serve both as a context for Digital Harlem and as a reference for a print publication.

Permalink for this paragraph 0 The blog post “Traffic accidents in 1920s Harlem,” for example, both provides context for a map and an extension of an argument in a forthcoming article. The 784-word post describes the broad pattern of accidents, the character of the traffic on Lenox and Seventh Avenues, traffic police posts and the reactions to black officers, and an example of the racial conflict that some accidents produced.  It includes screenshots of a map of accidents, and that map with traffic police posts added (with instructions on how to create the maps in Digital Harlem), together with photographs of children crossing the street, and Officer Reuben Carter directing traffic. The article that will link to the post includes two paragraphs focused on the racial conflicts that occurred as a result of accidents, but no maps or photographs, only brief mentions of the broader patterns of accidents and no discussion of the origins of the traffic police posts.25 The posts on individual lives take a slightly different approach to elaborating what can be gleaned from the map.  In writing about Perry Brown, I drew on his probation file to craft a narrative of this slice of his life, and used his membership of a fraternal lodge as a way into a broader discussion of lodges in Harlem, with a map of their locations, a photograph of members of one Elks lodge and an image of the Imperial Elks’ Hall. In this case, the post does not serve as an elaborated footnote; our published analysis of Brown’s life is considerably more detailed, but it lacks the maps and images incorporated in the post. Approached from the published article (or via a search engine), posts thus serve a mediating function, offering static screenshots that link to Digital Harlem, where dynamic maps can be recreated and explored.26

Permalink for this paragraph 0 Recently, as I realized I had considered the blog only in relationship to my project not to the larger Internet, Digital Harlem has led me to another form of online writing. I began this project implicitly subscribing to the “build it and they will come” assumption that underlies much digital history, the idea that going online immediately delivers an audience. It doesn’t. Search engines bring some users, but attracting more requires connecting your work to the rest of the web. Following the lead of other digital projects, I have turned to Wikipedia. I had hoped to merely add links to existing articles, but the originality of Digital Harlem means that few of the topics it deals with were mentioned. As a result, I have had to write contributions to articles, grappling with Wikipedia’s wariness about primary sources, blogs and citing yourself, and with the existing organization of the articles related to 1920s Harlem.27 The challenges of writing for Wikipedia are well documented elsewhere in this collection; what my experience adds to that discussion is an example of why such engagement is more meaningful to digital historians than to other scholars, and hence something not to be left to students.

Permalink for this paragraph 0 However I write about it, approaching 1920s Harlem through the maps created by Digital Harlem, using the tools offered by the geospatial web, has literally caused the way I think about the neighborhood to go through a spatial turn. Maps of the variety of sources my colleagues and I have gathered confront me with the multiple places that made up Harlem and the wide variety of events that took place there.  Trying to understand those maps draws me down to the level of individual places, and to the relations between them, into the web of locations in which individuals lived their lives, where they resided, worked and spent their leisure time. Used in this way, the geospatial web can capture “the confluence of multiple rhythms” that Henri Lefebvre argued make up everyday life, offering a new perspective on what it was like to live in Harlem.28

Permalink for this paragraph 0 About the author:  Stephen Robertson is an Associate Professor in the Department of History at the University of Sydney.  He is currently working on a history of undercover surveillance in the US from 1865-1940, and collaborating with Shane White and Stephen Garton on “Year of the Riot: Harlem, 1935,” a project which will extend Digital Harlem into the 1930s.

Permalink for this paragraph 0 Acknowledgement: Digital Harlem exists thanks to an Australian Research Council Discovery Grant (DP0343148), on which I collaborated with Shane White, Stephen Garton and Graham White, all due thanks for gathering the sources used in the project and for supporting the development of the site.

  1. Permalink for this paragraph 0
  2. Gilbert Osofsky, Harlem: The Making of a Ghetto, 2nd ed. (New York: Harper Collins, 1971), xvi; James Weldon Johnson, Black Manhattan (New York: Da Capo Press, 1991 (1930), 147; David Levering Lewis, When Harlem Was in Vogue (New York: Penguin, 1981), 193-94; Jervis Anderson, This Was Harlem: 1900-1950 (New York: Farrar Straus & Giroux, 1981), 128, 174, 236.
  3. Shane White, Stephen Robertson, Stephen Garton, and Graham White, “Black Metropolis: Harlem 1915-1930,” Department of History, University of Sydney, http://sydney.edu.au/arts/history/research/projects/harlem.shtml.
  4. Ian Gregory and Paul Ell, Historical GIS: Technologies, Methodologies and Scholarship (Cambridge: Cambridge University Press, 2007), 1-19, 89-90; Anne Kelly Knowles, “GIS and History,” in Placing History: How Maps, Spatial Data and GIS are Changing Historical Scholarship, ed. Amy Hillier and Anne Kelly Knowles (Redlands, CA: ESRI Press, 2008), 2-7; David Bodenhamer, “History and GIS: Implications for the Discipline,” in Placing History, 222-230.
  5. Digital Harlem: Everyday Life, 1915-1930, http://www.acl.arts.usyd.edu.au/harlem/. Damien Evans took the lead in designing our database and site, and later, Andrew Wilson created the overlay map. “Arts eResearch,” http://sydney.edu.au/arts/eresearch/; Muki Haklay, Alex Singleton and Chris Parker, “Web Mapping 2.0: The Neogeography of the GeoWeb,” Geography Compass 2, 6 (2008): 2011-2039; and Trevor Harris, Jesse Rouse and Susan Bergeron, “The Geospatial Semantic Web, Pareto GIS, and the Humanities,” in The Spatial Humanities: GIS and the Future of Humanities Scholarship, ed. David Bodenhamer, John Corrigan and Trevor Harris (Bloomington: Indiana University Press, 2010), 124-142.
  6. Irma Watkins-Owens does include an analysis of the residents of a single block in her study of West Indians in Harlem, Blood Relations: Caribbean Immigrants and the Harlem Community, 1900-1930 (Bloomington: Indiana University Press, 1996).
  7. Johnson, 147; Osofsky, xv-xvii; Cheryl Lynn Greenberg, “Or Does It Explode?” Black Harlem in the Great Depression (New York: Oxford University Press, 1991), i; Stephen Watson, The Harlem Renaissance: Hub of African-American Culture, 1920-1930 (New York: Pantheon, 1995).
  8. “The Map,” Digital Harlem Bloghttp://digitalharlemblog.wordpress.com/digital-harlem-the-site/the-map/.
  9. Gregory and Ell, 185.
  10.  Karen Halttunen, “Groundwork: American Studies in Place – Presidential Address to the American Studies Association, November 4, 2005,” American Quarterly 58, 1 (March 2006): 2.
  11. Karen Kemp, “Geographic Information Science and Spatial Analysis for the Humanities,” in The Spatial Humanities, 32.
  12. Edward Ayers and others, “Valley of the Shadow: Maps and Images, Augusta County,” http://valley.lib.virginia.edu/VoS/maps/augustamaps.html, and “Valley of the Shadow: Maps and Images, Franklin County,” http://valley.lib.virginia.edu/VoS/maps/franklinmaps.html. For discussions of this site, see Gregory and Ell, 195-98; and Knowles, 5-6.
  13. See “Interchange: The Promise of Digital History,” Journal of American History 95, 2 (September 2008): 484.
  14. Harris, Rouse and Bergeron, 130.
  15. David Bodenhamer, John Corrigan and Trevor Harris, “Introduction,” in The Spatial Humanities, vii.
  16. Gregory and Ell, 94.
  17. Stephen Robertson, “Harlem Undercover: Vice Investigators, Race and Prostitution in the 1920s,” Journal of Urban History 35, 4 (May 2009): 486-504; Stephen Robertson, “Harlem Undercover – the maps,” Digital Harlem Blog, http://digitalharlemblog.wordpress.com/2009/04/17/harlem-undercover-the-maps/.
  18. Wallace Thurman, “Negro Life in New York’s Harlem: A Lively Picture of a Popular and Interesting Section” (1927), in The Collected Writings of Wallace Thurman, eds. Amritjit and Daniel M. Scott III (New Brunswick, NJ: Rutgers University Press, 2003), 40-41; Anderson, This Was Harlem, 319-323.
  19. Stephen Robertson, “Traffic Accidents in 1920s Harlem,” Digital Harlem Blog, http://digitalharlemblog.wordpress.com/2010/04/01/traffic-accidents-in-1920s-harlem/.
  20. Stephen Robertson, Shane White and Stephen Garton, “Harlem in Black and White: Mapping Race and Place in the 1920s,” Journal of Urban History (forthcoming 2012).
  21. Lines are only one of the ways that Digital Harlem can visualize time. Layers can also represent different time periods, providing an image of change over time. A fairly straightforward example, a map with layers for prostitution arrests in 1925 and 1930, can be found in Stephen Robertson, “Prostitution Arrests,” Digital Harlem Blog, http://digitalharlemblog.wordpress.com/2009/10/05/prostitution-arrests/.
  22. Court of General Sessions Probation Department Case File (PDCF), 11076 (1928) (Municipal Archives). We have employed pseudonyms for individuals on probation, as required by Municipal Archives. See also Stephen Robertson, “Morgan Thompson – a West Indian Laborer’s Life in Harlem,” Digital Harlem Blog, http://digitalharlemblog.wordpress.com/2009/12/01/morganthompson/; and Stephen Robertson, Shane White, Stephen Garton and Graham White, “This Harlem Life: Black Families and Everyday Life in the 1920s and 1930s,” Journal of Social History 44, 1 (2010): 97-98, 100-4.
  23. Stephen Robertson, “Harlem and Baseball in the 1920s,” Digital Harlem Blog, http://digitalharlemblog.wordpress.com/2011/07/27/baseball-1920s-harlem/.
  24. PDCF 15872 (1930); Stephen Robertson, “Perry Brown: A Lodge member’s life in Harlem,” Digital Harlem Blog, http://digitalharlemblog.wordpress.com/2010/07/15/perry-brown-lodge-member/; Robertson, et al, “This Harlem Life,” 104-8.
  25. Stephen Robertson, Digital Harlem Blog, http://digitalharlemblog.wordpress.com.
  26. Robertson, “Traffic Accidents”; Robertson, White and Garton, “Harlem in Black and White.”
  27. Robertson, “Perry Brown”; Robertson, et al, “This Harlem Life,” 104-8.
  28. Stephen Robertson, “Digital Harlem and Wikipedia,” Digital Harlem Blog, http://digitalharlemblog.wordpress.com/2012/01/11/digital-harlem-and-wikipedia/.
  29. The description of Lefebvre’s argument is from Stefan Kipfer, Kaniska Goonwardena, Christian Schimd and Richard Milgrom, “On the Production of Henri Lefebvre,” in Space, Difference, Everyday Life: Reading Henri Lefebvre, ed. Kaniska Goonwardena, Stefan Kipfer, Richard Milgrom and Christian Schimd (New York: Routledge, 2008), 15.
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