Heidelberg, Universitätsbibliothek Heidelberg, Heid. Hs. 3929 D II,466,3 Waibel, Leo; Hettner, Alfred [Recp.]
Nachlass Alfred Hettner, Eingegangene Briefe, Korrespondenz Leo Waibel/Alfred Hettner: Brief von Leo Waibel an Alfred Hettner
— Berlin, 22.9.1911
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