David Rumsey
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Website
Geological Map of the United States.
3888.070
pilot4
Gray's Geological Map of the United States by Charles H. Hitchcock PhD, Professor of Geology in Dartmouth College. Philadelphia: O.W. Gray & SOn.
1878
Hitchcock, Charles H. (Charles Henry), 1836-1919
O.W. Gray & Son
69 × 43 cm
1 : 7428000