Sunspot drawing of 1986-2-18

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https://doi.org/10.7891/e-manuscripta-142084



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1986-02-18
13:00
Hs 1304.6:1527
https://doi.org/10.7891/e-manuscripta-142084
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group