Bartels, Julius <br/><br/>
Geomagnetic indices K and C, 1954 
Julius Bartels and J. Veldkamp  
 -  International Union of Geodesy and Geophysics   1955 
 - ix+116p. 
 - International Association of Geomagnetism and Aeronomy; No. 12i .
<br/><br/> Continuation of IATME Bulletins No.12-12h 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Iaga Bulletin-dataIaga IndicesIatme BulletinsIugg
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / IAGA