TY  - BOOK
AU  - Veldkamp, J. 
AU  - Siebert, M. 
ED  - International Association of Geomagnetism and Aeronomy
TI  - Geomagnetic data 1966: indices K and C
T2  - International Association of Geomagnetism and Aeronomy; No. 12u1
PY  - 1969///
CY  - Paris
PB  - International Union of Geodesy and Geophysics 
KW  - Iaga Bulletin No.12u1Iaga Bulletin-dataIaga IndicesIugg
ER  -