Nelson, James H.  <br/><br/>
Magnetism of the earth 
James H. Nelson 
 - Washington, D. C.  U.S. Government Printing Office  1962 
 - iv+79p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth's MagnetismMagnetic Earth
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / NEL