A map of the main Dutch dialect groupings, based on a map by the Dutch linguist W.J. Heeringa. Source/Reference work: <a rel="nofollow" class="external text" href="http://www.wjheeringa.nl/thesis/thesis09.pdf">Measuring Dialect Pronunciation Differences using Levenshtein Distance, Chapter 9 Measuring Dutch dialect distances. pp.332-334</a> as published by Groningen University (2004).
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