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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Coal mines are named among miners in accordance with the method of approach from the surface to the vein. The entrance pictured above is a ? and full cars are hauled uphill to the surface opening. This particular slope mine is famous because within it the U.S. Bureau of Mines conducts a great variety of mining experiments." The New York Public Library Digital Collections. 1860 - 1920. https://qa-digitalcollections.nypl.org/items/510d47d9-b4c0-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Coal mines are named among miners in accordance with the method of approach from the surface to the vein. The entrance pictured above is a ? and full cars are hauled uphill to the surface opening. This particular slope mine is famous because within it the U.S. Bureau of Mines conducts a great variety of mining experiments." New York Public Library Digital Collections. Accessed November 27, 2024. https://qa-digitalcollections.nypl.org/items/510d47d9-b4c0-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1860 - 1920). Coal mines are named among miners in accordance with the method of approach from the surface to the vein. The entrance pictured above is a ? and full cars are hauled uphill to the surface opening. This particular slope mine is famous because within it the U.S. Bureau of Mines conducts a great variety of mining experiments. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47d9-b4c0-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47d9-b4c0-a3d9-e040-e00a18064a99 | title=
(still image)
Coal mines are named among miners in accordance with the method of approach from the surface to the vein. The entrance pictured above is a ? and full cars are hauled uphill to the surface opening. This particular slope mine is famous because within it the U.S. Bureau of Mines conducts a great variety of mining experiments., (1860 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=November 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>