Hazard, Daniel L <br/><br/>
The earth's magnetism 
Daniel L Hazard                                             
 - Washington  Government Printing Office  1925 
 - 52p. 
 - Special publication; no. 117 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>Geomagnetism
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / HAZ