Author: RICHARDSON, G.B.
Title: Geologic atlas of the United States. No. 198. Castle Rock folio, Colorado.
Description: 1915. U.S. Geol. Survey, Washington. 13 pp. 6 fig. 1 pl. w. section, 2 photoplts. 3 plts. h.t. with col. maps. Orig. wrps. with libr. stamp, very good, folio (47x55 cm).

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