"This dialect is of the Pomo family, but differs considerably from all the Pomo vocabularies in Powell's Contributions, Volume III, 491 sqq." -- note on title page by A. S. Gatschet.
There are many similar manuscripts and text documents at NAA from different researchers, ethnographers and linguists. Vocabulary and language of the Pomo communities seems to be a heavily researched and documented topic at NAA.
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