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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Chemist running microscopic test on sweet potato starch at plant, Laurel, Mississippi" The New York Public Library Digital Collections. 1938. https://qa-digitalcollections.nypl.org/items/7e4dfa10-d6ec-0136-f616-09f4750cea12
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Chemist running microscopic test on sweet potato starch at plant, Laurel, Mississippi" New York Public Library Digital Collections. Accessed November 28, 2024. https://qa-digitalcollections.nypl.org/items/7e4dfa10-d6ec-0136-f616-09f4750cea12
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1938). Chemist running microscopic test on sweet potato starch at plant, Laurel, Mississippi Retrieved from https://qa-digitalcollections.nypl.org/items/7e4dfa10-d6ec-0136-f616-09f4750cea12
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/7e4dfa10-d6ec-0136-f616-09f4750cea12 | title=
(still image)
Chemist running microscopic test on sweet potato starch at plant, Laurel, Mississippi, (1938)|author=Digital Collections, The New York Public Library |accessdate=November 28, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>