Sunspot drawing of 1964-9-17

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https://doi.org/10.7891/e-manuscripta-94095



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1964-09-17
07:15
Hs 1304.5:2400
https://doi.org/10.7891/e-manuscripta-94095
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group