TY  - BOOK
AU  - Twenhhofel, William Henry,
CN  - QE662 .T9
CN  - QE662
CY  - New York :
DA  - 1954.
ID  - 64802
KW  - Geology, Stratigraphic
PB  - Geological Society of America,
PP  - New York :
PY  - 1954.
T1  - Correlation of the Ordovician formations of North America /
TI  - Correlation of the Ordovician formations of North America /
VL  - 65 ; p. 247-298
ER  -