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1by Matthaei, Carl Christian, 1770-1847“...Helwing,...”
Published 1827
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2by Werlhof, Paul Gottlieb, 1699-1767“...Helwing,...”
Published 1775
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3by Matthaei, Carl Christian, 1770-1847“...Helwing,...”
Published 1827
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4by Stromeyer, Georg Friedrich Louis, 1804-1876, Stromeyer, Georg Friedrich Louis, 1804-1876, Stromeyer, Georg Friedrich Louis, 1804-1876“...Helwing,...”
Published 1838
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6by Trotha, Thilo Lebrecht Ernst Michael von, 1841-1917“...Helwing'sche Verlagsbuchhandlung,...”
Published 1887
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7by Stuckrad, Wilhelm W. von“...Helwing'sche Verlags-Buchh,...”
Published 1879
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8by Bogdanovich, E. V (Evgenīĭ Vasilʹevich), 1829-1914“...Helwing'sche Verlags-Buchh,...”
Published 1880
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