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020 _a013522764X
040 _cOST
100 0 _aKRASHEN, Stephen D.
_912799
245 1 0 _aLanguage acquisition and language education :
_bExtensions and applications /
_cStephen D. Krashen
260 _aNew York :
_bPrentice Hall ;
_c1989.
300 _a146 p.
504 _aIncludes bibliographical references
650 0 _aEnglish language
_xStudy and learning.
_912800
942 _2lcc
_cB
999 _c93315
_d93315