TY  - BOOK
AU  - Shrock, Robert R
TI  - Principles Of Invertbrate Paleontology
U1  - 560 
PY  - 1953///
CY  - Tokyo
PB  - Mcgraw Hill
KW  - General Stack
KW  - Paleontology; paleozoology
KW  - Invertbrate
KW  - Zoology
ER  -