TY  - BOOK
AU  - shrock,Robert R., Twenhofel, William H.
AU  - x
TI  - Principles of invertebrate paleontology: x
SN  - x
U1  - 562/S561p 
PY  - 1987///
CY  - Delhi
PB  - CBS
KW  - Fossils
KW  - Zoology
N1  - Incudes
ER  -