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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Demonstration plot of hybrid corn planted at Iowa State Fair. Des Moines, Iowa" The New York Public Library Digital Collections. 1939. https://digitalcollections.nypl.org/items/6c35c570-17da-0139-3acb-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Demonstration plot of hybrid corn planted at Iowa State Fair. Des Moines, Iowa" New York Public Library Digital Collections. Accessed March 13, 2025. https://digitalcollections.nypl.org/items/6c35c570-17da-0139-3acb-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1939). Demonstration plot of hybrid corn planted at Iowa State Fair. Des Moines, Iowa Retrieved from https://digitalcollections.nypl.org/items/6c35c570-17da-0139-3acb-0242ac110003
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/6c35c570-17da-0139-3acb-0242ac110003 | title=
(still image)
Demonstration plot of hybrid corn planted at Iowa State Fair. Des Moines, Iowa, (1939)|author=Digital Collections, The New York Public Library |accessdate=March 13, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>