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Part 1 Language shift - a preliminary analysis: what this book is about and it is needed try to reverse language shift and is it really possible to do so where and why does language shift occur and how can it be reversed? how threatened is threatened? Part 2 Case studies - a baker's dozen from several continents. Part 3 Safeguarding the future: on RLS-focused language planning and on dialect-standard issues and corpus planning in particular the intergenerational transmission of additional languages for special purpose limitations on school effectiveness in connection with mother tongue transmission theoretical recapitulation.
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Kohn et al. (1992) studied this question.
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