TY  - BOOK
AU  - Sabben, D. Van, ed.
ED  - International Association of Geomagnetism and Aeronomy
TI  - Geomagnetic data 1974: indices, rapid variations, special intervals
T2  - International Association of Geomagnetism and Aeronomy Bulletin; No. 32e
PY  - 1975///
CY  - Holland
PB  - International Union of Geodesy and Geophysics 
KW  - Iaga Bulletin-dataIaga IndicesIugg
ER  -