Sunspot drawing of 1973-10-21

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https://doi.org/10.7891/e-manuscripta-97321



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1973-10-21
07:30
Hs 1304.5:5207
https://doi.org/10.7891/e-manuscripta-97321
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group