TY  - BOOK
T1  - A gravity survey of extreme southeastern Illinois
DA  - 1970.
CY  - Urbana,
AU  - Heigold, Paul C.
VL  - 450
CN  - QE105
CN  - QE105
PB  - Illinois State Geological Survey,
PP  - Urbana,
PY  - 1970.
N1  - Cover title.
ID  - 54111
KW  - Gravity
TI  - A gravity survey of extreme southeastern Illinois
ER  -