Sunspot drawing of 1974-5-21

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https://doi.org/10.7891/e-manuscripta-97879



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1974-05-21
07:00
Hs 1304.5:5374
https://doi.org/10.7891/e-manuscripta-97879
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group