Sunspot drawing of 1975-1-31

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https://doi.org/10.7891/e-manuscripta-98170



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1975-01-31
08:30
Hs 1304.5:5596
https://doi.org/10.7891/e-manuscripta-98170
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group