TY  - BOOK
AU  - Van Sabben, D., ed.
TI  - Geomagnetic data 1971: indices, rapid variations, special intervals
T2  - IAGA Bulletin; no. 32 b
PY  - 1972///
CY  - Paris
PB  - IUGG Publications
KW  - Astronomy and astrophysics thesaurus
KW  - Geomagnetism
ER  -