Sunspot drawing of 1977-4-10

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https://doi.org/10.7891/e-manuscripta-98633



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1977-04-10
08:00
Hs 1304.5:6261
https://doi.org/10.7891/e-manuscripta-98633
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group