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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Spreading lime to increase productivity of soil before planting winter wheat on Emery M. Hopper's tobacco farm in Corbett Ridge section. Caswell County, North Carolina." The New York Public Library Digital Collections. 1940. https://digitalcollections.nypl.org/items/a26894a0-913f-013c-498b-0242ac110002
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Spreading lime to increase productivity of soil before planting winter wheat on Emery M. Hopper's tobacco farm in Corbett Ridge section. Caswell County, North Carolina." New York Public Library Digital Collections. Accessed February 11, 2025. https://digitalcollections.nypl.org/items/a26894a0-913f-013c-498b-0242ac110002
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1940). Spreading lime to increase productivity of soil before planting winter wheat on Emery M. Hopper's tobacco farm in Corbett Ridge section. Caswell County, North Carolina. Retrieved from https://digitalcollections.nypl.org/items/a26894a0-913f-013c-498b-0242ac110002
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/a26894a0-913f-013c-498b-0242ac110002 | title=
(still image)
Spreading lime to increase productivity of soil before planting winter wheat on Emery M. Hopper's tobacco farm in Corbett Ridge section. Caswell County, North Carolina., (1940)|author=Digital Collections, The New York Public Library |accessdate=February 11, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>