Author: BRADDOCK, W.A.
Title: Geology of the Empire Quadrangle, Grand, Gilpin, and Clear Creek counties, Colorado.
Description: 1969. US Geological Survey Professional Paper 616; 56 pp. 28 fig./phot. 3 fold. plts. in pocket, incl. fold. & col. geol. map 1:24,000. Orig. wrps. with libr. stamp, otherwise and contents very good, 4to.

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