Sunspot drawing of 1964-4-30

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https://doi.org/10.7891/e-manuscripta-93950



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1964-04-30
07:30
Hs 1304.5:2260
https://doi.org/10.7891/e-manuscripta-93950
Observer : Sergio Cortesi
Seeing (SIDC) : 1
No group