Sunspot drawing of 1989-12-13

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https://doi.org/10.7891/e-manuscripta-144572



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1989-12-13
14:30
Hs 1304.6:2715
https://doi.org/10.7891/e-manuscripta-144572
Observer : Sergio Cortesi
Seeing (SIDC) : 0
No group