Revision history of "Ulrich Ammon et al. Variantenwörterbuch des Deutschen. Die Standardsprache in Österreich, der Schweiz und Deutschland sowie in Liechtenstein, Luxemburg, Ostbelgien und Südtirol. Berlin/New York: Walter de Gruyter. 2004. lxxv + 954 pages. ISBN 311016575" (Q8931)
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