Becker, George F.  1847-1919. <br/><br/>
Relations between local magnetic disturbances and the genesis of petroleum, 
by George F. Becker. 
 - Washington,  Govt. Print. Off.,  1909. 
 - 24 p.  fold. map.  24 cm. 
 - U.S. Geological Survey bulletin  401 .
<br/><br/><label>LCCN: </label>gs 09000278  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petroleum.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 401 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.3:401