Sunspot drawing of 1974-9-22

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https://doi.org/10.7891/e-manuscripta-97900



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1974-09-22
09:15
Hs 1304.5:5490
https://doi.org/10.7891/e-manuscripta-97900
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group