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Detailed Reference Information
Wolfer 1921
Wolfer, A. (1921). Provisional sun-spot numbers for 1920. Terrestrial Magnetism and Atmospheric Electricity 26: doi: 10.1029/TE026i004p00135. issn: 0096-8013.
Journal
Terrestrial Magnetism and Atmospheric Electricity
Publisher
American Geophysical Union
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