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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "One of the natural springs cleaned and purified on the Pine Ridge project. Sioux County, Nebraska" The New York Public Library Digital Collections. 1936. https://digitalcollections.nypl.org/items/9548c750-190f-0138-a8cf-175547f5b2ad
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "One of the natural springs cleaned and purified on the Pine Ridge project. Sioux County, Nebraska" New York Public Library Digital Collections. Accessed April 27, 2024. https://digitalcollections.nypl.org/items/9548c750-190f-0138-a8cf-175547f5b2ad
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1936). One of the natural springs cleaned and purified on the Pine Ridge project. Sioux County, Nebraska Retrieved from https://digitalcollections.nypl.org/items/9548c750-190f-0138-a8cf-175547f5b2ad
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/9548c750-190f-0138-a8cf-175547f5b2ad | title=
(still image)
One of the natural springs cleaned and purified on the Pine Ridge project. Sioux County, Nebraska, (1936)|author=Digital Collections, The New York Public Library |accessdate=April 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>