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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 Posey County, Indiana. Grass has been planted in an effort to slow the process of gully formation" The New York Public Library Digital Collections. 1937. https://old-digitalcollections.nypl.org/items/b013d170-aad7-0136-3787-75b6137b8698
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Soil erosion in Posey County, Indiana. Grass has been planted in an effort to slow the process of gully formation" New York Public Library Digital Collections. Accessed October 6, 2026. https://old-digitalcollections.nypl.org/items/b013d170-aad7-0136-3787-75b6137b8698
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1937). Soil erosion in Posey County, Indiana. Grass has been planted in an effort to slow the process of gully formation Retrieved from https://old-digitalcollections.nypl.org/items/b013d170-aad7-0136-3787-75b6137b8698
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/b013d170-aad7-0136-3787-75b6137b8698 | title=
(still image)
Soil erosion in Posey County, Indiana. Grass has been planted in an effort to slow the process of gully formation, (1937)|author=Digital Collections, The New York Public Library |accessdate=October 6, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>