Sunspot drawing of 1976-9-21

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https://doi.org/10.7891/e-manuscripta-98466



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1976-09-21
07:00
Hs 1304.5:6113
https://doi.org/10.7891/e-manuscripta-98466
Observer : Araldo Pittini
Seeing (SIDC) : 4
No group