Sunspot drawing of 1987-3-13

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https://doi.org/10.7891/e-manuscripta-142876



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1987-03-13
09:00
Hs 1304.6:1850
https://doi.org/10.7891/e-manuscripta-142876
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group