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