Sunspot drawing of 1975-4-1

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https://doi.org/10.7891/e-manuscripta-98067



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1975-04-01
09:15
Hs 1304.5:5641
https://doi.org/10.7891/e-manuscripta-98067
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group