Sunspot drawing of 1964-6-21

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https://doi.org/10.7891/e-manuscripta-93875



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1964-06-21
09:45
Hs 1304.5:2309
https://doi.org/10.7891/e-manuscripta-93875
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group