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1Published 1840“...Helwing,...”
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2by Mithoff, H. Wilhelm H“...Helwing,...”
Published 1871
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3by Brüel, L. A (Ludewig Augustus), 1773-1838“...Helwing,...”
Published 1870
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5Published 1840“...Helwing,...”
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6by Grotefend, G. A“...Helwing'sche Hofbuchhandlung,...”
Published 1857
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