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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Team of two gold miners operating hand drill in contest on Labor Day, Silverton, Colorado" The New York Public Library Digital Collections. 1940. https://qa-digitalcollections.nypl.org/items/3e819e60-f588-0136-6441-07385e7ed9bd
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Team of two gold miners operating hand drill in contest on Labor Day, Silverton, Colorado" New York Public Library Digital Collections. Accessed November 26, 2024. https://qa-digitalcollections.nypl.org/items/3e819e60-f588-0136-6441-07385e7ed9bd
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1940). Team of two gold miners operating hand drill in contest on Labor Day, Silverton, Colorado Retrieved from https://qa-digitalcollections.nypl.org/items/3e819e60-f588-0136-6441-07385e7ed9bd
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/3e819e60-f588-0136-6441-07385e7ed9bd | title=
(still image)
Team of two gold miners operating hand drill in contest on Labor Day, Silverton, Colorado, (1940)|author=Digital Collections, The New York Public Library |accessdate=November 26, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>