Kashaya language, a distinct Pomo language on the Sonoma County Coastline, California
The Pomo, Kashaya, Tolowa and Yurok of Northern California boiled the leaves of Western Labrador Tea similarly, to make a medicinal tisane.
The final major work of his life was to produce a series of films about the peoples of Northern California such as the Pomo, particularly the Kashaya.
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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).
Robert L. Oswalt, who wrote a grammar of the related Kashaya (Southwestern Pomo) language, began to collect Southern Pomo data approximately twenty years after Halpern's fieldwork.