Sunspot drawing of 1977-7-17

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https://doi.org/10.7891/e-manuscripta-98645



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1977-07-17
07:00
Hs 1304.5:6342
https://doi.org/10.7891/e-manuscripta-98645
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group