Universitätsbibliothek Heidelberg, Heid. Hs. 3695 EM 2,1 Maanen, Adriaan van; Mount Wilson Solar Observatory, Carnegie Institute of Washington; Wolf, Max [Recp.]
Briefe von Adriaan van Maanen an Max Wolf: Karte von Adriaan van Maanen von Carnegie Institute of Washington Mount Wilson Solar Observatory an Max Wolf
— Pasadena, California, USA, 19.2.1920
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