Sunspot drawing of 1977-3-17

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https://doi.org/10.7891/e-manuscripta-98845



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1977-03-17
08:00
Hs 1304.5:6245
https://doi.org/10.7891/e-manuscripta-98845
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group