Sonnenfleckenzeichnung unnummeriert, einen Zürcher Lückentag ergänzend.Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 10.10.1950, erstellt von Dr. Manfred Lang, Sonnenobservatorium Kanzelhöhe, Kärnten

[s.n.]
1950 · doi:10.7891/e-manuscripta-111938 · W6959306455
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