Sunspot drawing of 1974-12-9

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https://doi.org/10.7891/e-manuscripta-97740



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1974-12-09
09:30
Hs 1304.5:5553
https://doi.org/10.7891/e-manuscripta-97740
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group