TY  - BOOK
AU  - Simpson, George Gaylord,
TI  - Principles of animal taxonomy
T2  - Columbia biological series, no. 20
AV  - QL351 .S5 1961
U1  - 591 
PY  - 1961///
CY  - New York
PB  - Columbia University Press
KW  - Animals
KW  - Classification
N1  - Includes bibliographical references and index
ER  -