Sunspot drawing of 1964-9-21

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https://doi.org/10.7891/e-manuscripta-94149



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1964-09-21
08:30
Hs 1304.5:2404
https://doi.org/10.7891/e-manuscripta-94149
Observer : Araldo Pittini
Seeing (SIDC) : 2
No group