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Obituary: MNRAS 93, 236 (1933); AN 247, 313 (1933); A. Kopff in VJS 68, 1. Heft (1933)
Wolf's first private Observatory in Heidelberg (Merzgasse)
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Building the Königstuhl Observatory, Heidelberg
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16 cm (f/5) Astrographic Refractor
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Königstuhl Observatory with 16" Bruce-Refractor
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72 cm (f/4) Waltz-Reflector
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