Universitätsbibliothek Heidelberg, Heid. Hs. 3695 EP 60,3 Plummer, Henry Crozier; University of Oxford. Observatory; Wolf, Max [Recp.]
Briefe von Henry Crozier Plummer an Max Wolf: Brief von Henry Crozier Plummer von University of Oxford. Observatory an Max Wolf
— Oxford, 7.1.1902
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