TY  - BOOK
AU  - Sabben, D. Van
AU  - Siebert, M.
ED  - International Association of Geomagnetism and Aeronomy
TI  - Geomagnetic data 1969: indices K and Ci
T2  - International Association of Geomagnetism and Aeronomy; No. 12x1
PY  - 1971///
CY  - Paris
PB  - International Union of Geodesy and Geophysics 
KW  - Iaga Bulletin No.12x1Iaga Bulletin-dataIaga IndicesIugg
ER  -