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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Soil erosion in the cornfield on William Keefe's farm in Benton County, Indiana. Note subsoil, and gradation to fertile topsoil from left to right. This county has the best soil in the state" The New York Public Library Digital Collections. 1937. https://digitalcollections.nypl.org/items/fba631a0-aadf-0136-392f-5dd17037c491
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Soil erosion in the cornfield on William Keefe's farm in Benton County, Indiana. Note subsoil, and gradation to fertile topsoil from left to right. This county has the best soil in the state" New York Public Library Digital Collections. Accessed January 17, 2025. https://digitalcollections.nypl.org/items/fba631a0-aadf-0136-392f-5dd17037c491
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1937). Soil erosion in the cornfield on William Keefe's farm in Benton County, Indiana. Note subsoil, and gradation to fertile topsoil from left to right. This county has the best soil in the state Retrieved from https://digitalcollections.nypl.org/items/fba631a0-aadf-0136-392f-5dd17037c491
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/fba631a0-aadf-0136-392f-5dd17037c491 | title=
(still image)
Soil erosion in the cornfield on William Keefe's farm in Benton County, Indiana. Note subsoil, and gradation to fertile topsoil from left to right. This county has the best soil in the state, (1937)|author=Digital Collections, The New York Public Library |accessdate=January 17, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>