TY  - BOOK
AU  - Grim, Ralph E.
CN  - QE471
CN  - QE471
CY  - Urbana,
DA  - 1957.
ID  - 18224
KW  - Shale
KW  - Geology, Stratigraphic
PP  - Urbana,
PY  - 1957.
T1  - Petrology of the Paleozoic shales of Illinois,
TI  - Petrology of the Paleozoic shales of Illinois,
VL  - 203
ER  -