NASA NTRS · 19680012074
The geomagnetic secular variation 1900-1965
Abstract
Geomagnetic field secular variation /1900 to 1965/
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Cain, J. C., Hendricks, S. J.. 1968-04-01. The geomagnetic secular variation 1900-1965. https://ntrs.nasa.gov/citations/19680012074
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