Swanson, Roger W.  1914- <br/><br/>
Geology and phosphate deposits of the Permian rocks in Central western Montana / 
by Roger W. Swanson. 
 -- Washington :   United States Government Printing Office,   1973 
 - P. 779-833 + 1 map. -- 
 (Geological Survey Professional Paper  ;  313-F).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología<br/>Montana
<br/><br/><label>Universal Decimal Class. No.: </label>55(786)