TY  - BOOK
AU  - Simpson,George Gaylord
TI  - Principles of animal taxonomy
T2  - Columbia biological series, no. 20
U1  - 590.12 SIM/P 
PY  - 1961///
CY  - . - New York
PB  - : Columbia University Press
KW  - Animals
KW  - Classification
ER  -