Sunspot drawing of 1976-9-20

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https://doi.org/10.7891/e-manuscripta-98469



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1976-09-20
07:00
Hs 1304.5:6112
https://doi.org/10.7891/e-manuscripta-98469
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group