Transactions of the general scientific assembly, Madrid, Spain, 1969 
edited by Leroy R. Alldredge 
 - Paris  International Union of Geodesy and Geophysics   1969 
 - International Association of Geomagnetism and Aeronomy Bulletin; No. 27 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Iaga Bulletin No.27Iaga BulletinIugg
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / ALL