Geomagnetic data 1974  indices, rapid variations, special intervals 
edited by D. Van Sabben  
 - Holland  International Union of Geodesy and Geophysics   1975 
 - xii+95p. 
 - International Association of Geomagnetism and Aeronomy Bulletin; No. 32e .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Iaga Bulletin-dataIaga IndicesIugg
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / IAGA