TY  - BOOK
T1  - Mineral production in Illinois in 1968 /
DA  - 1969.
CY  - Urbana :
AU  - Busch, Willis L.
VL  - 447.
CN  - QE105
CN  - QE105
PB  - Illinois State Geological Survey,
PP  - Urbana :
PY  - 1969.
ID  - 9855
KW  - Mines and mineral resources
TI  - Mineral production in Illinois in 1968 /
ER  -