Washington: United States Government Printing Office, 1935. Fourth Edition (Revised and Enlarged). 8vo, vii, 126 pages; VG-; gray cover with black print, bump to lower right corner with creasing throughout, some spotting, small tear at base of spine; interior clean but for slight spotting, some foxing on page edges; at head of title: "United States Department of the Interior ... Geological Survey."
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