Sunspot drawing of 1997-2-21

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https://doi.org/10.7891/e-manuscripta-149682



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1997-02-21
09:00
Hs 1304.6:4917
https://doi.org/10.7891/e-manuscripta-149682
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group