Sunspot drawing of 1975-4-11

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https://doi.org/10.7891/e-manuscripta-98262



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1975-04-11
07:15
Hs 1304.5:5648
https://doi.org/10.7891/e-manuscripta-98262
Observer : Sergio Cortesi
Seeing (SIDC) : 2
No group