Sunspot drawing of 1973-12-30

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https://doi.org/10.7891/e-manuscripta-97459



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1973-12-30
08:30
Hs 1304.5:5267
https://doi.org/10.7891/e-manuscripta-97459
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group