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In this paper I discuss various issues directly related to the study of Breton dialects, and to the practice of linguistic geography. Some of the questions that will be considered are: Where does the border pass between two contiguous dialectal areas? How can the geographical distribution of the varieties of a language be explained? What factors (social, economic, cultural, religious, political, etc) can be correlated with this geographic distribution?
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Denis Costaouec (2012) studied this question.
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