Lewis, George Edward  1908-1997 <br/><br/>
Early Permian vertebrates from the Cutler formation of the Placerville area Colorado / 
by George Edward Lewis and Peter Paul Vaughn. 
 -- Washington :   United States Government Printing Office,   1965 
 - 50 p. -- 
 (Geological Survey Professional Paper  ;  503-C).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Colorado<br/>Vertebrados fósiles
<br/><br/><label>Universal Decimal Class. No.: </label>566(788)