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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 JULY TO SEPTEMBER, 1943. Terrestrial Magnetism and Atmospheric Electricity 48: doi: 10.1029/TE048i004p00228. issn: 0096-8013.
Journal
Terrestrial Magnetism and Atmospheric Electricity
Publisher
American Geophysical Union
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