Geography and geology of a portion of southwestern Wyoming with special reference to coal and oil.
1907. US Geological Survey Professional Paper 56; 178 pp. 9 fig./phot. 26 plts. h.t.partly with fossils, and incl. 3 fold. & col. maps in back pocket. Orig. wrps. with libr. stamps, ends of spine a bit worn, and margins of backpocket as well, but contents very good, 4to.
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