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Johnston 1941
Johnston, H.F. (1941). American URSI Broadcasts of Cosmic Data, Giving American Magnetic Character-Figure, C A, Three-Hour-Range Indices, K, and Mean K-Indices, K A, for April to June, 1941. Terrestrial Magnetism and Atmospheric Electricity 46. doi: 10.1029/TE046i003p00360-02. issn: 0096-8013.
Journal
Terrestrial Magnetism and Atmospheric Electricity
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American Geophysical Union
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