Sunspot drawing of 1964-9-20

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https://doi.org/10.7891/e-manuscripta-94093



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1964-09-20
08:30
Hs 1304.5:2403
https://doi.org/10.7891/e-manuscripta-94093
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group