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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Sacramento Pit copper mine at Bisbee, Arizona. This is a pit 435 feet deep. In 1911 a shaft was sunk into the slopes of the east wall. In 1917 a dynamite charge blew off the top rock of the crown and dredges were worked to excavate the pit's ore bodies" The New York Public Library Digital Collections. 1940. https://old-digitalcollections.nypl.org/items/4e203b40-54be-0137-300f-43bd8225bbe8
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Sacramento Pit copper mine at Bisbee, Arizona. This is a pit 435 feet deep. In 1911 a shaft was sunk into the slopes of the east wall. In 1917 a dynamite charge blew off the top rock of the crown and dredges were worked to excavate the pit's ore bodies" New York Public Library Digital Collections. Accessed October 13, 2026. https://old-digitalcollections.nypl.org/items/4e203b40-54be-0137-300f-43bd8225bbe8
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1940). Sacramento Pit copper mine at Bisbee, Arizona. This is a pit 435 feet deep. In 1911 a shaft was sunk into the slopes of the east wall. In 1917 a dynamite charge blew off the top rock of the crown and dredges were worked to excavate the pit's ore bodies Retrieved from https://old-digitalcollections.nypl.org/items/4e203b40-54be-0137-300f-43bd8225bbe8
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/4e203b40-54be-0137-300f-43bd8225bbe8 | title=
(still image)
Sacramento Pit copper mine at Bisbee, Arizona. This is a pit 435 feet deep. In 1911 a shaft was sunk into the slopes of the east wall. In 1917 a dynamite charge blew off the top rock of the crown and dredges were worked to excavate the pit's ore bodies, (1940)|author=Digital Collections, The New York Public Library |accessdate=October 13, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>