TY  - BOOK
T1  - The Middle Devonian strata of southern Illinois
DA  - 1969.
CY  - Urbana,
AU  - North, William G.
VL  - 441
CN  - QE105
CN  - QE105
PB  - Illinois State Geological Survey,
PP  - Urbana,
PY  - 1969.
N1  - Cover title.
ID  - 53603
KW  - Geology, Stratigraphic
KW  - Geology
TI  - The Middle Devonian strata of southern Illinois
ER  -