TY  - BOOK
ED  - Geological Survey (U.S.)
TI  - Geology of parts of the upper Mississippi Valley zinc-lead district
T2  - Bulletin
AV  - QE75 .B9 no. 1123
PY  - 1960///-1966]
CY  - Washington
PB  - U.S. Govt. Print. Off.
KW  - Geology
KW  - Mississippi River Valley
KW  - Mines and mineral resources
KW  - Lead ores
KW  - Zinc ores
N1  - Part of illustrative matter folded in pocket; Issued as separate chapters A-I; Includes bibliographies
ER  -