Sunspot drawing of 1973-8-17

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https://doi.org/10.7891/e-manuscripta-97611



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1973-08-17
08:30
Hs 1304.5:5150
https://doi.org/10.7891/e-manuscripta-97611
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group