Knopf, Adolph,  1882- <br/><br/>
Ore deposits of the Helena mining region, Montana / 
by Adolph Knopf. 
 - Washington,  Govt. Print. Off.,  1913. 
 - 143 p. :  ill., plates, fold. maps, diagrs. ;  24 cm. 
 - U.S. Geological survey. Bulletin 527 .
 - United States.  Geological Survey.  Bulletin ;  527. .
<br/><br/> Some of the plates printed on both sides of leaf.  "Literature": p. 18-19.  Includes index. 
<br/><br/><label>LCCN: </label>gs 13000376  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources--Montana.<br/>Geology--Montana.
<br/><br/><label>LC Class. No.: </label>TN24.M9  / K5