Geomagnetic data 1975  indices, rapid variations, special intervals 
edited by D. Van Sabben  
 - Paris  International Union of Geodesy and Geophysics   1976 
 - xii+80p. 
 - International Association of Geomagnetism and Aeronomy Bulletin; No. 32f .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Iaga Bulletin No.32fIaga Bulletin-dataIaga IndicesIugg
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / IAGA