Sunspot drawing of 1976-7-21

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https://doi.org/10.7891/e-manuscripta-98512



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1976-07-21
06:30
Hs 1304.5:6057
https://doi.org/10.7891/e-manuscripta-98512
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group