Calvert, William R. <br/><br/>
Geology of the Lewistown coal field, Montana / 
by W.R. Calvert. 
 - Washington :  Government Printing Office,  1909. 
 - 83 p. :  ill., 5 plates (incl. 2 fold. maps) ;  23 cm. 
 - United States.  Geological Survey.  Bulletin ;  390 .
<br/><br/><label>LCCN: </label>gs 09000437  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Montana.<br/>Coal--Montana.
<br/><br/><label>LC Class. No.: </label>TN805.M9  / C2