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Johnston 1943
Johnston, H.F. (1943). American magnetic character-figure, CA, three-hour-range indices, K, and mean K-indices, KA, for October to December, 1942, and summary for year 1942. Terrestrial Magnetism and Atmospheric Electricity 48: doi: 10.1029/TE048i001p00019. issn: 0096-8013.
Journal
Terrestrial Magnetism and Atmospheric Electricity
Publisher
American Geophysical Union
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