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1894年9月1日

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太阳黑子极小期的延长

作者：E. Walter Maunder

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This article was originally published with the title “A Prolonged Sunspot Minimum” in SA Supplements Vol. 38 No. 974supp (September 1894), p. 15569
doi:10.1038/scientificamerican09011894-15569bsupp

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