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Evolution of the Mother Tongue, New York: John Wiley & Sons, ISBN 978-0-471-58426-1. Ruhlen, Merritt (1998), "The Origin of the Na-Dene", PNAS, 95 (23):...

Evolution of the Mother Tongue, New York: John Wiley & Sons, ISBN 978-0-471-58426-1 RUHLEN, Merritt (1994b), On the Origin of Languages: Studies in Linguistic...