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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Proposed site for scientific study camp. Ash Creek Canyon, Pine Ridge project, Nebraska" The New York Public Library Digital Collections. 1936. https://digitalcollections.nypl.org/items/9a9f1350-190f-0138-fd47-05f4c6577bdc
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Proposed site for scientific study camp. Ash Creek Canyon, Pine Ridge project, Nebraska" New York Public Library Digital Collections. Accessed February 6, 2025. https://digitalcollections.nypl.org/items/9a9f1350-190f-0138-fd47-05f4c6577bdc
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1936). Proposed site for scientific study camp. Ash Creek Canyon, Pine Ridge project, Nebraska Retrieved from https://digitalcollections.nypl.org/items/9a9f1350-190f-0138-fd47-05f4c6577bdc
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(still image)
Proposed site for scientific study camp. Ash Creek Canyon, Pine Ridge project, Nebraska, (1936)|author=Digital Collections, The New York Public Library |accessdate=February 6, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>