TY  - BOOK
AU  - Bartels,Julius
AU  - Romana,A.
AU  - Veldkamp,J.
TI  - Geomagnetic data indices K and C 1956
U1  - 538.74 
PY  - 1959///
CY  - Amsterdam
PB  - North-Holland
KW  - Magnetism
KW  - Geomagnetism
N1  - International association of geomagnetism and aeronomy formaly known as association of terrestrail magnetism and electricity
ER  -