TY  - BOOK
AU  - Shrock,Robert R.
AU  - Twenhofel,William H.
TI  - Principles of invertebrate paleontology
U1  - 562 
PY  - 1953/// [reprinted 1999]
CY  - New Delhi, New York
PB  - CBS Publishers & Distributors
KW  - Invertebrates, Fossil
N1  - Includes index; "A revised and enlarged edition of Twenhofel and Shrock, Invertebrate paleontology."
ER  -