TY  - BOOK
T1  - Geological structure of the zinc-lead district of northwestern Illinois /
DA  - 1947.
CY  - Urbana, Ill. :
AU  - Willman, H. B.
AU  - Reynolds, Robert Ramon,
VL  - no. 124
CN  - QE105
CN  - QE105
PB  - State Geological Survey,
PP  - Urbana, Ill. :
PY  - 1947.
ID  - 19331
KW  - Lead mines and mining
KW  - Zinc mines and mining
KW  - Geology
TI  - Geological structure of the zinc-lead district of northwestern Illinois /
ER  -