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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Isidore Singer, Ph.D. Projector and manging editor, Chief of Department of Modern Biography." The New York Public Library Digital Collections. https://digitalcollections.nypl.org/items/b7868fe1-bb09-7a25-e040-e00a1806666b
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Isidore Singer, Ph.D. Projector and manging editor, Chief of Department of Modern Biography." New York Public Library Digital Collections. Accessed April 26, 2024. https://digitalcollections.nypl.org/items/b7868fe1-bb09-7a25-e040-e00a1806666b
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. Isidore Singer, Ph.D. Projector and manging editor, Chief of Department of Modern Biography. Retrieved from https://digitalcollections.nypl.org/items/b7868fe1-bb09-7a25-e040-e00a1806666b
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