We wish to help you with what you are looking for and can recommend the following book:
BOCK, KARL N. Mittelniederdeutsch und heutiges Plattdeutsch im ehemaligen Dänischen Herzogtum Schleswig. Studien zur beleuchtung des sprachwechsels in ANgeln und Mittelschleswig. Köbenhavn Ejnar Munksgaard 1948. 8:o. 196,(2) pp. + XVI Tafeln. Publisher´s printed wrappers. Sewn as issued. (Det Kgl. Danske Videnskabernes Selskab Historisk-filologiske meddelelser, Bind XXXI, Nr. 1). 24 x 15,5 cm. DKK~ 160 NOK~ 170 SEK 200 EUR~ 20 USD~ 33 GBP~ 15 JPY~ 3.477 · ANT68557 · Antiquaria, Göteborg (SE) ·

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