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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Blue Ribbon No. 2 mine, one of the largest gopher holes" The New York Public Library Digital Collections. 1939. https://qa-digitalcollections.nypl.org/items/2ab07630-027c-0138-478e-21239c7419a2
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Blue Ribbon No. 2 mine, one of the largest gopher holes" New York Public Library Digital Collections. Accessed January 6, 2025. https://qa-digitalcollections.nypl.org/items/2ab07630-027c-0138-478e-21239c7419a2
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1939). Blue Ribbon No. 2 mine, one of the largest gopher holes Retrieved from https://qa-digitalcollections.nypl.org/items/2ab07630-027c-0138-478e-21239c7419a2
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/2ab07630-027c-0138-478e-21239c7419a2 | title=
(still image)
Blue Ribbon No. 2 mine, one of the largest gopher holes, (1939)|author=Digital Collections, The New York Public Library |accessdate=January 6, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>