Szukana fraza: [Abstract = "The article is concerned with the study of the development of Polish in particular regions. This major aspect of historic\-lingustic research refers to mainly the peripheries of the country, which for centuries remained outside the mainstream development of the Polish language. Special attention is given to Upper Silesia, a region which was ethnically and socially diverse and which until late Middle Ages stayed under foreign \(Czech and German\) cultural influences."]