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World Magnetic Charts for 1980 — spherical harmonic models of the geomagnetic field and its secular variation |
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| Authors: | F. S. Barker D. R. Barraclough S. R. C. Malin |
| Affiliation: | United States Naval Oceanographic Office, Magnetics Division, Bay St Louis, Mississippi 39522, USA;Geomagnetism Unit, Institute of Geological Sciences, Edinburgh EH9 3LA |
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