Sunspot drawing of 1976-7-20

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https://doi.org/10.7891/e-manuscripta-98309



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1976-07-20
07:15
Hs 1304.5:6056
https://doi.org/10.7891/e-manuscripta-98309
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group