Sunspot drawing of 1977-4-9

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https://doi.org/10.7891/e-manuscripta-98808



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1977-04-09
08:00
Hs 1304.5:6260
https://doi.org/10.7891/e-manuscripta-98808
Observer : Araldo Pittini
Seeing (SIDC) : 2
No group