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4by Osterrieth, Armin, 1873-“...Helwing,...”
Published 1913
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5by Adamy, Rudolf, 1850-1898“...Helwing,...”
Published 1887
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8by Mithoff, H. Wilh. H (Hector Wilhelm Heinrich)“...Helwing'sche Verlagsbuchhandlung,...”
Published 1885
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