Sunspot drawing of 1975-4-21

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https://doi.org/10.7891/e-manuscripta-98253



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1975-04-21
10:00
Hs 1304.5:5657
https://doi.org/10.7891/e-manuscripta-98253
Observer : Araldo Pittini
Seeing (SIDC) : 4
No group