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The upcoming publication "Migration Period between Oder and Vistula" (it will be published soon, and in English) summarizes the findings of several years long research project of the same name.
Supposedly the most interesting findings are from Central Poland from a region known as Kujawy (or Cuiavia/Kuyavia in English). Apparently - unlike the rest of Poland and East Germany - Cuiavia was not affected by depopulation during the Migration Period.
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