Sunspot drawing of 1973-8-13

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https://doi.org/10.7891/e-manuscripta-97487



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1973-08-13
06:30
Hs 1304.5:5146
https://doi.org/10.7891/e-manuscripta-97487
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group