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3. Geomagnetic secular variation and its changes, 1942.5 to 1962.5;Malin;Geophys. J. R. Astr.,1969
4. An equation for estimating westward drift;James;J. Geosmagn. Geoelectr.,1968
5. Relation of the westward drift of the geomagnetic field to the rotation of the Earth's core;Richmond;J. Geophys. Res.,1969