TY  - BOOK
AU  - Watson DMS
TI  - Origin of frogs
U1  - 567.6(70) 
PY  - 1940///
CY  - Edinburgh
PB  - Royal Soc
KW  - Amphibia
KW  - North America
N1  - Published in Trans of Royal Soc of Edinburgh - Part 1 : 60(7) 1939-1940
ER  -