TY  - BOOK
AU  - Sabben, D. Van 
AU  - Siebert, M. 
ED  - International Association of Geomagnetism and Aeronomy
TI  - Geomagnetic data 1968: indices K and Ci
T2  - International Association of Geomagnetism and Aeronomy; No. 12w1
PY  - 1970///
CY  - Paris
PB  - International Union of Geodesy and Geophysics 
KW  - Iaga Bulletin No.12w1Aga Bulletin-dataIaga IndicesIugg
ER  -