TY  - BOOK
AU  - Shrock, Robert R
AU  - Shrock, Robert R Twenhofel, William H.
TI  - Principle Of Inverterbrate Paleontology
U1  - H61 
PY  - 1953///
CY  - New York
PB  - Mcgraw-hill Book Company
KW  - H61
ER  -