Sunspot drawing of 1974-1-7

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https://doi.org/10.7891/e-manuscripta-97953



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1974-01-07
08:30
Hs 1304.5:5271
https://doi.org/10.7891/e-manuscripta-97953
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group