Sunspot drawing of 1987-1-13

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https://doi.org/10.7891/e-manuscripta-142989



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1987-01-13
14:15
Hs 1304.6:1805
https://doi.org/10.7891/e-manuscripta-142989
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group