Inquiry: Dead and/or endangered languages of the Americas

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From:  "Peter I. Gorvitz" <gorvitzp at union.edu>

Hello,

I am researching endangered or dead tribal
languages in Siberia and the Americas.  I am
wondering whether any information is readily
available on the effect of interaction by
newer, settled populations on the language
and culture of the tribe or population
theretofore not contacted.

Thank you for your time.

Peter Gorvitz.