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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Gang plow of type that broke up forest land for farming. Pine Ridge project, Nebraska" The New York Public Library Digital Collections. 1936. https://digitalcollections.nypl.org/items/24eaf090-1b71-0138-5cda-73d675a4f4d4
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Gang plow of type that broke up forest land for farming. Pine Ridge project, Nebraska" New York Public Library Digital Collections. Accessed January 30, 2025. https://digitalcollections.nypl.org/items/24eaf090-1b71-0138-5cda-73d675a4f4d4
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1936). Gang plow of type that broke up forest land for farming. Pine Ridge project, Nebraska Retrieved from https://digitalcollections.nypl.org/items/24eaf090-1b71-0138-5cda-73d675a4f4d4
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/24eaf090-1b71-0138-5cda-73d675a4f4d4 | title=
(still image)
Gang plow of type that broke up forest land for farming. Pine Ridge project, Nebraska, (1936)|author=Digital Collections, The New York Public Library |accessdate=January 30, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>