Sunspot drawing of 1987-7-4

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https://doi.org/10.7891/e-manuscripta-142839



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1987-07-04
08:30
Hs 1304.6:1946
https://doi.org/10.7891/e-manuscripta-142839
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group