Sunspot drawing of 1987-2-20

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https://doi.org/10.7891/e-manuscripta-142931



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1987-02-20
10:30
Hs 1304.6:1830
https://doi.org/10.7891/e-manuscripta-142931
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group