Campbell, Wallace H.  1926- <br/><br/>
Geomagnetism applications / 
by Wallace H. Campbell. 
 - Washington :  Denver, CO :  U.S. G.P.O. ;  Free on application to U.S. Geological Survey, Information Services,  1995. 
 - iv, 31 p. :  ill., maps ;  28 cm. 
 - U.S. Geological Survey circular ;  1109 .
<br/><br/>Includes bibliographical references (p. 30-31). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetism--Industrial applications.
<br/><br/><label>LC Class. No.: </label>QC815.2  / .C36 1995