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Detailed Reference Information
Brunner 1929
Brunner, W. (1929). Provisional sunspot-numbers for January to March, 1929. Terrestrial Magnetism and Atmospheric Electricity 34: doi: 10.1029/TE034i002p00158. issn: 0096-8013.
Journal
Terrestrial Magnetism and Atmospheric Electricity
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American Geophysical Union
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