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Group of miners in the main tunnel (1 1/2 miles long) of a huge coal mine, Pittsburg, Pa., U.S.A. 1868?-1915?

Group of miners in the main tunnel (1 1/2 miles long) of a huge coal mine, Pittsburg, Pa., U.S.A. 1868?-1915?
Ext0 New York Public Library
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This is an Anaglyph (what is that?)
Created about 9 years ago
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