Sunspot drawing of 1977-7-31

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https://doi.org/10.7891/e-manuscripta-98619



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1977-07-31
14:00
Hs 1304.5:6355
https://doi.org/10.7891/e-manuscripta-98619
Observer : Araldo Pittini
Seeing (SIDC) : 2
No group