Sunspot drawing of 1975-4-13

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https://doi.org/10.7891/e-manuscripta-98078
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1975-04-13
06:45
Hs 1304.5:5650
https://doi.org/10.7891/e-manuscripta-98078
Observer : Araldo Pittini
Seeing (SIDC) : 3
No group