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Bartels et al. 1939

Bartels, J., Heck, N.H. and Johnston, H.F. (1939). The three-hour-range index measuring geomagnetic activity. Terrestrial Magnetism and Atmospheric Electricity 44: doi: 10.1029/TE044i004p00411. issn: 0096-8013.

Journal
Terrestrial Magnetism and Atmospheric Electricity

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American Geophysical Union
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