Keefer, William R.  1924- <br/><br/>
Frontier, cody, and Mesaverde formations in the wind river and southern Bighorn basins, Wyoming / 
by William R. Keefer. 
 -- Washington :   United States Government Printing Office,   1972 
 - 23 p. + map. -- 
 (Geological Survey Professional Paper  ;  495-E).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología<br/>Wyoming
<br/><br/><label>Universal Decimal Class. No.: </label>55(787)