Sunspot drawing of 1975-4-19

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https://doi.org/10.7891/e-manuscripta-98230



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1975-04-19
07:30
Hs 1304.5:5655
https://doi.org/10.7891/e-manuscripta-98230
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group