Sunspot drawing of 1975-4-2

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https://doi.org/10.7891/e-manuscripta-98202



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1975-04-02
07:45
Hs 1304.5:5642
https://doi.org/10.7891/e-manuscripta-98202
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group