Geomagnetic data 1971 indices, rapid variations, special intervals edited by D. Van Sabben - Paris International Union of Geodesy and Geophysics 1972 - xii+105p. - International Association of Geomagnetism and Aeronomy Bulletin; No. 32b . Subjects--Topical Terms: Iaga Bulletin No.32bIaga Bulletin-dataIaga IndicesIugg Universal Decimal Class. No.: 550.38 / IAGA