Geological map of the New Almaden Mining District

Relief shown by contours. Contour interval 200 feet. Shows mine shafts and furnaces. "G.F. Becker, Geologist in charge." "U.S. Geological Survey, Monograph XIII, Atlas sheet VII."

Geological Survey (U.S.); Bodfish, S. W.

1885

Washington, D.C. : U.S. Geological Survey

1:15 000

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