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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Black Hawk. This place is noted for its quartz mills, distance 40 miles from Denver, elevation 8200 ft." The New York Public Library Digital Collections. 1850 - 1930. https://digitalcollections.nypl.org/items/510d47e1-62be-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Black Hawk. This place is noted for its quartz mills, distance 40 miles from Denver, elevation 8200 ft." New York Public Library Digital Collections. Accessed January 29, 2025. https://digitalcollections.nypl.org/items/510d47e1-62be-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1850 - 1930). Black Hawk. This place is noted for its quartz mills, distance 40 miles from Denver, elevation 8200 ft. Retrieved from https://digitalcollections.nypl.org/items/510d47e1-62be-a3d9-e040-e00a18064a99
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(still image)
Black Hawk. This place is noted for its quartz mills, distance 40 miles from Denver, elevation 8200 ft., (1850 - 1930)|author=Digital Collections, The New York Public Library |accessdate=January 29, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>