The Westphalian language reference article from the English Wikipedia on 24-Apr-2004
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Westphalian language

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Westphalian is one of the major dialect groups of Low Saxon. Its most salient feature is the diphthongization (rising diphthongs). For example, we get iEten instead of E:ten for eat. The Westphalian dialect region includes the northern part of North Rhine-Westphalia, i.e. the former Prussiann province of Westphalia excluding the Siegerland and the region around Osnabrück.