Sunspot drawing of 1964-9-18

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https://doi.org/10.7891/e-manuscripta-94078



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1964-09-18
07:00
Hs 1304.5:2401
https://doi.org/10.7891/e-manuscripta-94078
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group