TY  - BOOK
T1  - Stratigraphic policy of the Illinois State Geological Survey
DA  - 1958.
CY  - Urbana,
AU  - Willman, H. B.
CN  - QE105
CN  - QE105
PB  - Division of the Illinois State Geological Survey,
PP  - Urbana,
PY  - 1958.
ID  - 17433
KW  - Geology
KW  - Rocks
KW  - Geology, Stratigraphic.
TI  - Stratigraphic policy of the Illinois State Geological Survey
ER  -