Sunspot drawing of 1987-2-7

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https://doi.org/10.7891/e-manuscripta-142791



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1987-02-07
08:30
Hs 1304.6:1825
https://doi.org/10.7891/e-manuscripta-142791
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group