Sunspot drawing of 1973-10-20

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https://doi.org/10.7891/e-manuscripta-97596



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1973-10-20
10:00
Hs 1304.5:5206
https://doi.org/10.7891/e-manuscripta-97596
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group