Wells, Roger Clark,  1877-1944. <br/><br/>
Electric activity in ore deposits / 
by Roger C. Wells. 
 - Washington,  Govt. Print. Off.,  1914. 
 - 78 p. :  diagrs, ;  24 cm. 
 - U.S. Geological survey. Bulletin 548 .
 - United States.  Geological Survey.  Bulletin ;  548. .
<br/><br/> Includes index. 
<br/><br/><label>LCCN: </label>gs 14000639  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ore deposits.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 548