The species problem :  A symposium presented at the atlanta meeting of the american association for the advancement of science, december 28 29, 1955 / 
Ed by ernst mayr. 
 - ix, 395 páginas 
 - Su publication ;  50 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Especies
<br/><br/><label>LC Class. No.: </label>QH366  / A7