Sunspot drawing of 1961-12-11

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https://doi.org/10.7891/e-manuscripta-92715



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1961-12-11
09:00
Hs 1304.5:1530
https://doi.org/10.7891/e-manuscripta-92715
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group