Sunspot drawing of 1977-2-28

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https://doi.org/10.7891/e-manuscripta-98703



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1977-02-28
08:00
Hs 1304.5:6230
https://doi.org/10.7891/e-manuscripta-98703
Observer : Sergio Cortesi
Seeing (SIDC) : 1
No group