wsu.edu: Common Errors In English Usage
Clear and concise explanation of the difference between correct and incorrect usage in American English spelling, grammar and idiom, with entertaining examples.
phon.ucl.ac.uk: Wells, Formants Of Pure Vowels
MA Thesis (1960) of Prof. J.C. Wells of the University of London concerning the pronunciation of vowels in "Received Pronunciation".
cooper.com: Alan Cooper's All About Homonyms
Extensive list of homonyms/homophones in American English from various sources, along with links.
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