TY  - BOOK
AU  - Bartels, Julius
AU  - Veldkamp, J.
ED  - International Association of Geomagnetism and Aeronomy
TI  - Geomagnetic indices K and C, 1951
T2  - International Association of Terrestrial Magnetism and Electricity Bulletin; No. 12f
PY  - 1952///
CY  - Washington, D. C.
PB  - International Union of Geodesy and Geophysics 
KW  - Iatme Bulletin No.12fIaga Bulletin-dataIaga IndicesIatme BulletinIugg
ER  -