Cressman, Earle Rupert  1923- <br/><br/>
Stratigraphy and petrology of the Permian rocks of South western Montana / 
by Earle R. Cressman and Roger W. Swanson. 
 -- Washington :   United States Government Printing Office,   1964 
 - P. 276-569 + 12 map. -- 
 (Geological Survey Professional Paper  ;  313-C).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Estratigrafía<br/>Montana
<br/><br/><label>Universal Decimal Class. No.: </label>551(786)