TY  - BOOK
T1  - Glaciation and origin of the geest in the Driftless Area of northwestern Illinois /
DA  - 1989.
CY  - Champaign, Ill. :
AU  - Willman, H. B.
AU  - Glass, H. D.
AU  - Frye, John C.
VL  - 535
CN  - QE105
CN  - QE105
CN  - QE471.2
PB  - Illinois State Geological Survey,
PP  - Champaign, Ill. :
PY  - 1989.
ID  - 155187
KW  - Geest
KW  - Glacial epoch
KW  - Geology
TI  - Glaciation and origin of the geest in the Driftless Area of northwestern Illinois /
ER  -