by Harry H. Crosby, Robert W. Emery
Do you use the dictionary more than you think you should? Are the business memos you write filled with embarrassing spelling mistakes? Have you received a lot of low grades on your papers because of poor spelling? This easy-to-use book not only teaches you how to avoid misspellings, but also sharpens your skills so you can recognize spelling errors right away. You’ll write clean English, improve your grades, and increase your chances for finding a new or better job.
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http://usafiles.net/1S1d/Better-Spelling-in-30-Minutes-a-Day-Better-English-Series.pdf