TY  - BOOK
AU  - Schrock, Robert,
AU  - Twenhofel, William.
TI  - Principles of invertebrate paleontology
T2  - International series in the earth sciences
U1  - 562 
PY  - 1953///
CY  - New York
PB  - McGraw-Hill
KW  - INVERTEBRADOS FOSILES
KW  - PALEONTOLOGIA
ER  -