Mayr, Ernst,  1904- <br/><br/>
Principles of systematic zoology / 
Erns Mayr. 
 - New York :  McGraw-Hill,  1969. 
 - xi, 428 p. :  illus. ;  23 cm. 
<br/><br/>Includes biblioraphy. 
<br/><br/> Open access. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animals--Classification.