Research by Dr. Bert Vaux (Dept. of Theoretical and Applied Linguistics) into regional variations in American English as part of the 2003 Harvard Dialect Survey has been used as the basis for a short film called Soda Pop Coke.
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You can try out a questionnaire published by the New York Times on 22 December 2013 based on the Harvard Dialect Survey.
http://www.nytimes.com/interactive/2013/12/20/sunday-review/dialect-quiz-map.html?smid=pl-share