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Hartnell 1927
Hartnell, G. (1927). Magnetic storm of April 13–14, 1927, as recorded at the U.S. Coast and Geodetic Survey Magnetic Observatory at Cheltenham, Maryland. Terrestrial Magnetism and Atmospheric Electricity 32: doi: 10.1029/TE032i002p00088-01. issn: 0096-8013.
Journal
Terrestrial Magnetism and Atmospheric Electricity
Publisher
American Geophysical Union
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