File:PSM V04 D410 Sunspot and protuberance frequency.jpg

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Description Sunspot and protuberance frequency
Date between 1873 and 1874
date QS:P,+1873-00-00T00:00:00Z/8,P1319,+1873-00-00T00:00:00Z/9,P1326,+1874-00-00T00:00:00Z/9
Source Popular Science Monthly Volume 4
Author Unknown authorUnknown author
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