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Schomburg Center for Research in Black Culture, Manuscripts, Archives and Rare Books Division, The New York Public Library. "The working population of Philadelphia, 1890" The New York Public Library Digital Collections. 1899. https://digitalcollections.nypl.org/items/510d47de-1bc9-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Manuscripts, Archives and Rare Books Division, The New York Public Library. "The working population of Philadelphia, 1890" New York Public Library Digital Collections. Accessed October 14, 2024. https://digitalcollections.nypl.org/items/510d47de-1bc9-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Manuscripts, Archives and Rare Books Division, The New York Public Library. (1899). The working population of Philadelphia, 1890 Retrieved from https://digitalcollections.nypl.org/items/510d47de-1bc9-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47de-1bc9-a3d9-e040-e00a18064a99 | title=
(text)
The working population of Philadelphia, 1890, (1899)
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