01003cam a2200265 4500 gs 68000268 DLC 20260227111422.0 691016s1968 dcub b 000 0 eng c gs 68000268 U.S. Geological Survey Library DLC DLC QE75 .C5 vol. 557 TN453.C6 S5 Copy 2. 553/.4 Sharp, William N. (William Neil), 1922- Lead, copper, molybdenum, and zinc geochemical anomalies south of the Summitville District, Rio Grande County, Colorado, by William N. Sharp and James L. Gualtieri. Washington, 1968. iii, 7 p. maps. 27 cm. Geological survey circular 557 Bibliography: p. 2. Lead ores Colorado Rio Grande County. Mines and mineral resources Colorado Rio Grande County. Gualtieri, James Louis, 1924- joint author. Geological Survey circular ; 557. 30489 30489