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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. "Mr. H. A. Watkins; Office 3510 Indiana Ave., Douglas 1714; Residence of Mr. And Mrs. Watkins; 3657 Michigan Ave." The New York Public Library Digital Collections. 1923. https://qa-digitalcollections.nypl.org/items/510d47df-759d-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "Mr. H. A. Watkins; Office 3510 Indiana Ave., Douglas 1714; Residence of Mr. And Mrs. Watkins; 3657 Michigan Ave." New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/510d47df-759d-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. (1923). Mr. H. A. Watkins; Office 3510 Indiana Ave., Douglas 1714; Residence of Mr. And Mrs. Watkins; 3657 Michigan Ave. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47df-759d-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47df-759d-a3d9-e040-e00a18064a99 | title=
(still image)
Mr. H. A. Watkins; Office 3510 Indiana Ave., Douglas 1714; Residence of Mr. And Mrs. Watkins; 3657 Michigan Ave., (1923)
|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>