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Detailed Reference Information
Brunner 1939
Brunner, W. (1939). Provisional sunspot-numbers for May and June, 1939. Terrestrial Magnetism and Atmospheric Electricity 44: doi: 10.1029/TE044i003p00246. issn: 0096-8013.
Journal
Terrestrial Magnetism and Atmospheric Electricity
Publisher
American Geophysical Union
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