Sunspot drawing of 1964-7-21

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https://doi.org/10.7891/e-manuscripta-94154



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1964-07-21
05:45
Hs 1304.5:2339
https://doi.org/10.7891/e-manuscripta-94154
Observer : Araldo Pittini
Seeing (SIDC) : 4
No group