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Definitive IGRF models for 1945, 1950, 1955, and 1960.
LANGEL, R. A., BARRACLOUGH, D. R., KERRIDGE, D. J., GOLOVKOV, V. P., SABAKA, T. J., ESTES, R. H.Volume:
40
Year:
1988
Journal:
Journal of geomagnetism and geoelectricity
DOI:
10.5636/jgg.40.645
File:
PDF, 6.01 MB
1988