01087cam a22003011 4500 gs 56000138 DLC 20260227111404.0 780627s1956 dcuabd b f000 0 eng gs 56000138 (OCoLC)4011740 DLC OClU OCoLC DLC n-us-co QE75 .P9 no. 258 QE92.S3 L3 557.88 Larsen, Esper S. (Esper Signius), 1879-1961. Geology and petrology of the San Juan region, southwestern Colorado, by Esper S. Larsen, Jr., and Whitman Cross. Washington, U.S. Govt. Print. Off., 1956. xiv, 303 p. illus., maps (3 col.) diagrs. (1 col.) tables. 29 cm. Geological Survey (U.S.). Professional paper, 258 Part of illustrative matter folded in pocket. Selected bibliography : p. 297-299. Geology Colorado. Petrology Colorado. San Juan Mountains (Colo. and N.M.) Cross, Whitman, 1854-1949, joint author. 29051 29051