01099cam a2200301 4500 gs 66000256 DLC 20260227111419.0 690605m19601966dcuab b 000 0 eng c gs 66000256 //r983 U.S. Geological Survey Library DLC DLC n-usm-- QE75 .B9 no. 1123 Geological Survey (U.S.) Geology of parts of the upper Mississippi Valley zinc-lead district. Washington, U.S. Govt. Print. Off. [1960-1966] 571 p. illus., maps (part col.) 24 cm. Bulletin no. 1123 Part of illustrative matter folded in pocket. Issued as separate chapters A-I. Includes bibliographies. Geology Mississippi River Valley. Mines and mineral resources Mississippi River Valley. Lead ores Mississippi River Valley. Zinc ores Mississippi River Valley. Mississippi Valley zinc-lead district. Geological Survey bulletin ; 1123. 30243 30243