The species problem  a symposium presented at the Atlanta meeting of the American Association for the Advancement of Science, December 28-29, 1955. 
Edited by Ernst Mayr. 
 - Washington  1957. 
 - ix, 395 p.  illus., maps.  24 cm. 
 - Its Publication  no. 50 .
 - Publication (American Association for the Advancement of Science)  no. 50. .
<br/><br/>Includes bibliographies. 
<br/><br/><label>LCCN: </label>57011321 //r85 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Species.--Congresses.
<br/><br/><label>LC Class. No.: </label>QH83  / .A73 1955 
<br/><br/><label>Dewey Class. No.: </label>575