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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Gopher hole employing steam power, Williamson County, Illinois" The New York Public Library Digital Collections. 1939. https://digitalcollections.nypl.org/items/b51b1690-027b-0138-a32e-178c82fdae73
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Gopher hole employing steam power, Williamson County, Illinois" New York Public Library Digital Collections. Accessed February 23, 2025. https://digitalcollections.nypl.org/items/b51b1690-027b-0138-a32e-178c82fdae73
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1939). Gopher hole employing steam power, Williamson County, Illinois Retrieved from https://digitalcollections.nypl.org/items/b51b1690-027b-0138-a32e-178c82fdae73
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(still image)
Gopher hole employing steam power, Williamson County, Illinois, (1939)|author=Digital Collections, The New York Public Library |accessdate=February 23, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>