Sunspot drawing of 1964-4-27

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https://doi.org/10.7891/e-manuscripta-93837



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1964-04-27
06:45
Hs 1304.5:2257
https://doi.org/10.7891/e-manuscripta-93837
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group