Sunspot drawing of 1977-1-20

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https://doi.org/10.7891/e-manuscripta-98817



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1977-01-20
13:30
Hs 1304.5:6199
https://doi.org/10.7891/e-manuscripta-98817
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group