Sunspot drawing of 1997-4-21

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https://doi.org/10.7891/e-manuscripta-149599



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1997-04-21
07:30
Hs 1304.6:4974
https://doi.org/10.7891/e-manuscripta-149599
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group