English: The diphthongisation of long vowels in Early New High German, distribution and chronology. This map is based on Map 35 in Theodor Frings, Grundlegung einer Geschichte der deutschen Sprache (1957), which is itself based on an original map by Kurt Wagner in Deutsche Sprachlandschaften (1927).
Wagner's distribution mapping draws on the data map from the Deutscher Sprachatlas for Haus, which can be seen at Regionalsprache.de.
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