TY  - BOOK
AU  - Shrock , Robert R. .
AU  - Twenhofel, W. H. .
TI  - Principles of Invertebrate Paleontology
U1  - 560 
PY  - 1953///
CY  - Delhi
PB  - CBS Publishers & Distributors
KW  - Invertebrate Paleontology
KW  - Geology
KW  - PG-Geology
KW  - G-Geology
KW  - Zoology
KW  - T/G-Zoology
N1  - Index
ER  -