Rare Dialects

[David Metevia]

An interesting article in the LA Times yesterday:

http://www.latimes.com/news/la-me-interpret21-2009feb21,0,5139254.story

This man could communicate easily in his home town and even somewhat
outside of that as he knows some Spanish.  However, it is a big culture
shock to be in California.

Are there examples in the US of AmE dialects so isolated from the
mainstream that most of us would have difficulty communicating?

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The American Dialect Society - http://www.americandialect.org