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Essentials of English Grammar:
In clear, concise terms, with lively examples, this convenient reference provides general usage rules for parts of speech, punctuation, capitalization, abbreviations, numbers, word division, spelling, and commonly confused words. This handy, easy-to-use guide provides essentials that are useful for people with the occasional question as well as those who are learning the basics. Style guidelines are included, with recommendations for achieving brevity, clarity and accuracy. [via]