TY  - BOOK
AU  - Shrock,Robert R.
AU  - Twenhofel,William H.
TI  - Principles of invertebrate paleontology
U1  - 562 
PY  - 1987///
CY  - New Delhi
PB  - CBS Publishers and Distributors
KW  - Fossil invertebrates
KW  - Paleontology
KW  - Protozoa
KW  - Porifera
KW  - Coelenterata
KW  - Ctenophora
KW  - Worm phyla
KW  - Bryozoa
KW  - Phoronida
ER  -