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This book develops the general principles of linguistic change thatform the foundations of historical linguistics, dialectology andsociolinguistics.  Demonstrates the social as well as cognitive relevance oflinguistic research Shows that rapid linguistic change is in progress in the citiesof America and England so that urban dialects are becoming more andmore differentiated Discusses factors that govern the internal development oflinguistic structures: the mechanisms of change, the constraints onchange, and the ways in which change is embedded in the largerlinguistic system