Sunspot drawing of 1964-7-20

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https://doi.org/10.7891/e-manuscripta-94156



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1964-07-20
06:00
Hs 1304.5:2338
https://doi.org/10.7891/e-manuscripta-94156
Observer : Araldo Pittini
Seeing (SIDC) : 4
No group