Kathlamet
Kathlamet was a Chinookan language once spoken in United States.
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Kathlamet (Cathlamet) was a Chinookan language that was spoken around the border of the U.S. states of Washington and Oregon by the Kathlamet people. The most extensive records of the language were made by Franz Boas, and a grammar was documented in the dissertation of Dell Hymes. It became extinct in the 1930s and there is little text left of it.
From Wikipedia · Kathlamet language · CC BY-SA 4.0