Geomagnetic secular variation and the 1969–1970 secular jerk at the African observatories

Author: Haile Tigistu  

Publisher: Faculty of Science, Addis Ababa, Ethiopia

ISSN: 0379-2897

Source: SINET: Ethiopian Journal of Science, Vol.27, Iss.2, 2004-12, pp. : 105-120

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