Heidelberg, Universitätsbibliothek Heidelberg, Heid. Hs. 3695 ES 126,3 Seares, Frederick Hanley; Mount Wilson Solar Observatory, Carnegie Institute of Washington; Wolf, Max [Recp.]
Briefe von Frederick Hanley Seares an Max Wolf: Brief von Frederick Hanley Seares von Carnegie Institute of Washington Mount Wilson Solar Observatory an Max Wolf
— Pasadena, California, 11.3.1930
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