Sunspot drawing of 1975-6-20

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https://doi.org/10.7891/e-manuscripta-98116



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1975-06-20
14:00
Hs 1304.5:5709
https://doi.org/10.7891/e-manuscripta-98116
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group