Yochelson, Ellis Leon   1928-2006 <br/><br/>
Permian gastropoda of the southwestern United States : 3. Bellerophontacea and Patellacea / 
Ellis L. Yochelson. 
 -- New York :   [s.n.],   1960 
 - p. 209-293, [6]p. de lám. -- 
 (Bulletin of the American Museum of Natural History ; 119,4).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gastrópodos
<br/><br/><label>Universal Decimal Class. No.: </label>594.3