20 books for better English

Files around 25mb each;all are pdfs except for one .chm (Ins and Outs of Prepositions)
contains the following books

Dictionary Cambridge English Grammar - Check Your Vocabulary for IELTS
Advanced English C A E Grammar Practice
American Accent Training
Basic English Usage-Oxford
Cambridge - English Vocabulary in Use - Elementary
Cambridge - English Vocabulary in Use - Pre-int Int
Cambridge - English Vocabulary in Use - Upp Adv
English Grammar–OUP–The Oxford Guide to English Usage
Essential Grammar in Use Supplementary Exercises
Ins and Outs of Prepositions
Jossey-Bass - English Brainstormers
L. Rozakis–English Grammar for the Utterly Confused
Longman English Grammar Practice Intermediate Self Study Edition
New Grammar Practice pre-int with key
NTC's American Idioms Dictionary
Phrasal Verb
Speak English LAA 1
The A-Z of Correct English Common Errors in English
WEBSTER Essential vocabulary
Word Formation In English

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