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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 on George Kroeger farm, six miles southwest of Smithland, Iowa. This land is being heavily eroded" The New York Public Library Digital Collections. 1936. https://digitalcollections.nypl.org/items/75742f20-a947-0136-6daf-0df8a31ebfe8
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Soil erosion on George Kroeger farm, six miles southwest of Smithland, Iowa. This land is being heavily eroded" New York Public Library Digital Collections. Accessed November 6, 2024. https://digitalcollections.nypl.org/items/75742f20-a947-0136-6daf-0df8a31ebfe8
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1936). Soil erosion on George Kroeger farm, six miles southwest of Smithland, Iowa. This land is being heavily eroded Retrieved from https://digitalcollections.nypl.org/items/75742f20-a947-0136-6daf-0df8a31ebfe8
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/75742f20-a947-0136-6daf-0df8a31ebfe8 | title=
(still image)
Soil erosion on George Kroeger farm, six miles southwest of Smithland, Iowa. This land is being heavily eroded, (1936)|author=Digital Collections, The New York Public Library |accessdate=November 6, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>