Bartels, Julius <br/><br/>
Geomagnetic data 1957  indices K and C, rapid variations 
Julius Bartels, A. Romana and J. Veldkamp 
 - Amsterdam  International Union of Geodesy and Geophysics   1961 
 - x+281p. 
 - International Association of Geomagnetism and Aeronomy; No. 12l .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Iaga Bulletin No.12lIaga Bulletin-dataIaga IndicesIugg
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / IAGA