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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Judges inspecting drill which will be used in miners power drilling contest at Labor Day celebration, Silverton, Colorado" The New York Public Library Digital Collections. 1940. https://qa-digitalcollections.nypl.org/items/d637a3f0-f587-0136-112d-3547321de435
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Judges inspecting drill which will be used in miners power drilling contest at Labor Day celebration, Silverton, Colorado" New York Public Library Digital Collections. Accessed November 29, 2024. https://qa-digitalcollections.nypl.org/items/d637a3f0-f587-0136-112d-3547321de435
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1940). Judges inspecting drill which will be used in miners power drilling contest at Labor Day celebration, Silverton, Colorado Retrieved from https://qa-digitalcollections.nypl.org/items/d637a3f0-f587-0136-112d-3547321de435
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/d637a3f0-f587-0136-112d-3547321de435 | title=
(still image)
Judges inspecting drill which will be used in miners power drilling contest at Labor Day celebration, Silverton, Colorado, (1940)|author=Digital Collections, The New York Public Library |accessdate=November 29, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>