Bartels, J <br/><br/>
Geomagnetic indices k and c, 1953 
J. Bartels and J Veldkemp                                                   
 - Washington  1954 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetic indices
<br/><br/><label>Universal Decimal Class. No.: </label>083.550.38  / IATME-12H