Sabben, D. Van <br/><br/>
Geomagnetic data 1969  indices K and Ci 
D. Van Sabben and M. Siebert 
 - Paris  International Union of Geodesy and Geophysics   1971 
 - viii+102p. 
 - International Association of Geomagnetism and Aeronomy; No. 12x1 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Iaga Bulletin No.12x1Iaga Bulletin-dataIaga IndicesIugg
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / IAGA