TY  - BOOK
AU  - Stebbins,Robert Cyril
TI  - A field guide to western reptiles and amphibians: field marks of all species in western North America, including Baja California 
T2  - The Peterson field guide series
SN  - 0-395-19421-0
AV  - QL651 S84
PY  - 1985///
N1  - Incluye bibliografia
ER  -