Rapid variations of earth's electromagnetic field:   Report of the geoelectric observatory 

 - Hyderabad:   National Geophysical Research Institute,   1973 
 - 156p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Report
<br/><br/><label>Universal Decimal Class. No.: </label>550.387(083.5)  / L4