Sunspot drawing of 1973-12-29

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https://doi.org/10.7891/e-manuscripta-97333



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1973-12-29
09:00
Hs 1304.5:5266
https://doi.org/10.7891/e-manuscripta-97333
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group