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Johnston 1945
Johnston, H.F. (1945). American magnetic character-figure, C A, three-hour-range indices, K, and mean K-indices, K A, for April to June, 1945. Terrestrial Magnetism and Atmospheric Electricity 50: doi: 10.1029/TE050i003p00237. issn: 0096-8013.
Journal
Terrestrial Magnetism and Atmospheric Electricity
Publisher
American Geophysical Union
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