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Simms' blue book and national Negro business and professional directory
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "James B. Mcgwin, Son & Co.; Real estate, renting, insurance and bonds; 3252 Indiana Ave., Telephones Douglass 3554-3647, Chicago, Ill." The New York Public Library Digital Collections. 1923. https://qa-digitalcollections.nypl.org/items/510d47df-75a1-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "James B. Mcgwin, Son & Co.; Real estate, renting, insurance and bonds; 3252 Indiana Ave., Telephones Douglass 3554-3647, Chicago, Ill." New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/510d47df-75a1-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. (1923). James B. Mcgwin, Son & Co.; Real estate, renting, insurance and bonds; 3252 Indiana Ave., Telephones Douglass 3554-3647, Chicago, Ill. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47df-75a1-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47df-75a1-a3d9-e040-e00a18064a99 | title=
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James B. Mcgwin, Son & Co.; Real estate, renting, insurance and bonds; 3252 Indiana Ave., Telephones Douglass 3554-3647, Chicago, Ill., (1923)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>