Sunspot drawing of 1964-7-31

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https://doi.org/10.7891/e-manuscripta-94065



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1964-07-31
05:30
Hs 1304.5:2353
https://doi.org/10.7891/e-manuscripta-94065
Observer : Araldo Pittini
Seeing (SIDC) : 4
No group