Holsteiner jüm-Gebiet:
Klaus Groth: Quickborn. page 320
Stader Geest:
Marcus Buck: attested by oral sources on the Stade Geest
Hamburg:
Otto Furcht: Wörterbuch der Sprache des Alten Landes bei Stade. Stalling, Oldenburg 1936, page 24
Altmark:
Heinrich Christoph Steinhart: Über die Altmark. 1802, page 144
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Plattmakers is a Low German dictionary that also provides translations in several languages. Get more infos.