Sunspot drawing of 1975-9-27

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https://doi.org/10.7891/e-manuscripta-98267



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1975-09-27
10:30
Hs 1304.5:5799
https://doi.org/10.7891/e-manuscripta-98267
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group