 | Cambridge Advanced Learner's Dictionary, Second Edition (Book & CD ROM)
Buy used from: $7.59 The best dictionary I've found for advanced learners.
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 | The Cambridge Encyclopedia of the English Language by David Crystal
Buy new: $32.03 / Used from: $20.10 A comprehensive study of the English language.
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 | The Official Guide to the New TOEFL iBT with CD-ROM (Official Guide to the Toefl Ibt) by Educational Testing Service
Buy used from: $5.99 For those poor souls who are facing the TOEFL.
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 | The American Accent Guide, Second Edition: A Complete and Comprehensive Course on the Pronunciation and Speaking Style of American English for Individuals of All Language Backgrounds / book and 8 CDs by Beverly A. Lujan
Buy new: $79.00 / Used from: $69.98 The site is aimed at British English learners. I really can't help much with American English, but this is the most comprehensive guide I've found.
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