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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Pit from which copper ore is extracted. One of the largest manmade holes in the earth. Ruth, Nevada" The New York Public Library Digital Collections. 1940. https://qa-digitalcollections.nypl.org/items/788fa7f0-8e53-0139-952a-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Pit from which copper ore is extracted. One of the largest manmade holes in the earth. Ruth, Nevada" New York Public Library Digital Collections. Accessed December 1, 2024. https://qa-digitalcollections.nypl.org/items/788fa7f0-8e53-0139-952a-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1940). Pit from which copper ore is extracted. One of the largest manmade holes in the earth. Ruth, Nevada Retrieved from https://qa-digitalcollections.nypl.org/items/788fa7f0-8e53-0139-952a-0242ac110003
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/788fa7f0-8e53-0139-952a-0242ac110003 | title=
(still image)
Pit from which copper ore is extracted. One of the largest manmade holes in the earth. Ruth, Nevada, (1940)|author=Digital Collections, The New York Public Library |accessdate=December 1, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>