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My suggestions would be Side by Side or American Streamline. Side by Side is good as it is probably the most well-known/respected "English only" series of books in the country. It will also give a lot of practice. "Streamline" will show a little less grammar and show less structured practice in the ...

Well, I don't know any websites offhand, but I know a very good book. Teaching American English Pronunciation (Avery and Ehrlich, OUP) is very good. It has a section that deals with exactly what you are asking about.