Sunspot drawing of 1960-4-17

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https://doi.org/10.7891/e-manuscripta-91657



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1960-04-17
13:30
Hs 1304.5:1005
https://doi.org/10.7891/e-manuscripta-91657
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group