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Dansk: Sammenligning mellem de to kort af C.F. Allen (Kaart over Folkesprogene i Hertugdömmet Slesvig eller Sønderjylland, 1858) og Geertz ("Karte über die Sprachverhältnisse im südlichen Schleswig",1838), Kilde: Kongelig Bibliotek Kbh.
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Sammenligning mellem de to kort af C.F. Allen (Kaart over Folkesprogene i Hertugdömmet Slesvig eller Sønderjylland, 1858) og Geertz ("Karte über die Sprachverhältnisse im südlichen Schleswig",1838), Kilde: Kongelig Bibliotek Kbh.