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1Published 1884“...Helwing,...”
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2by Gisevius, Hubert“...Helwing,...”
Published 1890
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3by Wichmann, Ernest, 1740-1802“...Helwing,...”
Published 1791
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4by Karmarsch, Karl, 1803-1879“...Helwing,...”
Published 1875
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6Published 1888“...Helwing,...”
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7by Müller, Hermann Alexander, 1814-1894“...Helwing,...”
Published 1876
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10by Schirmer, Friedrich, 1881-1926“...Helwing,...”
Published 1929
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12by Bozi, Alfred“...Helwing,...”
Published 1911
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17by Mangold, Ferdinand Franz, 1832-1903“...Helwing,...”
Published 1881
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