TY  - BOOK
AU  - Mayer,Ernst
AU  - Linsley,E.Gorton
AU  - Usinger,Robert L.
TI  - Methods and principles of systematic zoology 
U1  - 591 MAY  
PY  - 1953///.
CY  - New York : 
PB  - McGraw-Hill Book Company, Inc., 
KW  - Zoology
N1  - Includes index.
ER  -