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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "County agent with H.C. Clark, farmer who grows hybrid seed corn. Grundy Center, Iowa" The New York Public Library Digital Collections. 1939. https://qa-digitalcollections.nypl.org/items/3ecf70c0-73bf-0139-5223-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "County agent with H.C. Clark, farmer who grows hybrid seed corn. Grundy Center, Iowa" New York Public Library Digital Collections. Accessed December 20, 2024. https://qa-digitalcollections.nypl.org/items/3ecf70c0-73bf-0139-5223-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1939). County agent with H.C. Clark, farmer who grows hybrid seed corn. Grundy Center, Iowa Retrieved from https://qa-digitalcollections.nypl.org/items/3ecf70c0-73bf-0139-5223-0242ac110003
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/3ecf70c0-73bf-0139-5223-0242ac110003 | title=
(still image)
County agent with H.C. Clark, farmer who grows hybrid seed corn. Grundy Center, Iowa, (1939)|author=Digital Collections, The New York Public Library |accessdate=December 20, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>