Bertels, J <br/><br/>
Geomagnetic india k and c: 1949 (iatme bulletin 126) 
J. Bertels                                                  
 - Washington DC  1950 
 - 139p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetism
<br/><br/><label>Universal Decimal Class. No.: </label>083.550.38  / IATME-12C