Sunspot drawing of 1987-7-15

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https://doi.org/10.7891/e-manuscripta-142783



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1987-07-15
09:00
Hs 1304.6:1957
https://doi.org/10.7891/e-manuscripta-142783
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group