O'Harra, Cleophas C.  1866-1935. <br/><br/>
The mineral wealth of the Black Hills. 
By Cleophas C. O'Harra. 
 - Rapid City, S.D.,  1902. 
 - 88 p.  illus. 
 - South Dakota School of Mines. Bulletin no. 6. Department of geology .
 - South Dakota School of Mines and Technology.  Bulletin ;  no. 6. .
<br/><br/> "Published also as a part of Bulletin no. 3 of the South Dakota Geological Survey." 
<br/><br/><label>LCCN: </label>gs 06001159  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources--South Dakota.
<br/><br/><label>LC Class. No.: </label>TN24.S8  / A3 no. 6