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A method for isolating secular geomagnetic variation from shipboard total field measurements: a test case in the NE Atlantic;
Verhoef, J; Williams, C A. Geophysical Journal International vol. 115, no. 2, 1993 p. 471-481,
https://doi.org/10.1111/j.1365-246x.1993.tb01200.x 
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