Simpson, George Gaylord,  1902- <br/><br/>
Principles of animal taxonomy / 
G.G. Simpson 
 - New York :  Columbia University Press,  1961. 
 - 247 p. :  ill. ;  24 cm. 
 - Columbia biological series ;  no. 20 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Zoology--Classification
<br/><br/><label>Dewey Class. No.: </label>590.12 SIM