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The Pomo are an indigenous people of California. The historic Pomo territory in northern California was large, bordered by the Pacific Coast to the west, extending inland to Clear Lake, and mainly between Cleone and Duncans Point. One small group, the Northeastern Pomo of the Stonyford vicinity of Colusa County, was separated from the core Pomo area by lands inhabited by Yuki and Wintuan speakers.

Source: Wikipedia

The Pomo occupied the Pacific coast from just south of the Russian River north to the Fort Bragg area and from the ocean inland to just east of Clear Lake.  The Pomo did not have a government reservation.  It is estimated that their aboriginal population was as high at 8000 but was down to around 1200 by 1910.  Earlier Pomo baskets are very rare because traditionally baskets were burned with their maker. 

Reference Materials:

Native American Basketry of Central California by Christopher L. Moser

The Fine Art of California Indian Basketry by Brian Bibby