Sunspot drawing of 1986-9-13

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https://doi.org/10.7891/e-manuscripta-142123



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1986-09-13
08:00
Hs 1304.6:1701
https://doi.org/10.7891/e-manuscripta-142123
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group