Sunspot drawing of 1975-12-20

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https://doi.org/10.7891/e-manuscripta-98081



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1975-12-20
08:30
Hs 1304.5:5859
https://doi.org/10.7891/e-manuscripta-98081
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group