The diphthongisation of long vowels in Early New High German, distribution and chronology. This map is based on Map 35 in Theodor Frings, <i>Grundlegung einer Geschichte der deutschen Sprache</i> (1957), which is itself based on an original map by Kurt Wagner in <i>Deutsche Sprachlandschaften</i> (1927). <br><br>
Wagner's distribution mapping draws on the data map from the Deutscher Sprachatlas for <i>Haus</i>, which can be seen at <a rel="nofollow" class="external text" href="https://regionalsprache.de/SprachGIS/Map.aspx">Regionalsprache.de</a>.
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