The most important dissenter was Abraham M. Halpern, one of the few linguists since Barrett's time to collect comparative data on all of the Pomoan languages.
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Barrett's system of naming the languages of the Pomoan group included seven names based on geographical terms: Northern Pomo, Northeastern Pomo, Southern Pomo, Eastern Pomo, Central Pomo, Southeastern Pomo, and Southwest Pomo (now more commonly referred to as Kashaya).