01289cam a22003491 4500 gs 60000292 DLC 20260227111409.0 780125s1960 dcuab b f000 0 eng c gs 60000292 (OCoLC)3579086 U.S. Geol. Survey. Libr. MiGrC ISS DLC n-us-co QE75 .P9 no. 343 QE92.S3 S8 557.883 I 19.16:343 Steven, Thomas August, 1917- Geology and ore deposits of the Summitville district, San Juan Mountains, Colorado, by Thomas A. Steven and James C. Ratté. Washington, U.S. Govt. Print. Off., 1960. iv, 70 p. illus., maps (part col.) 30 cm. Geological Survey (U.S.) Professional paper 343 Part of illustrative matter fold. in pocket. "Prepared in cooperation with the Colorado Metal Mining Fund Board." Bibliography : p. 66-67. Geology Colorado. Petrology Colorado. Ore deposits Colorado. San Juan Mountains (Colo. and N.M.) Ratté, James Clifford, 1925- joint author. Summitville district, San Juan Mountains, Colorado. 29488 29488