Sunspot drawing of 1974-5-20

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https://doi.org/10.7891/e-manuscripta-97866



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1974-05-20
06:30
Hs 1304.5:5373
https://doi.org/10.7891/e-manuscripta-97866
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group