The Wappo (Ashochimi) lived along the headwaters of the Napa River and Pope and Putah creeks to the south of Clear Lake in northern California. They spoke a language of the Yukian family and probably number less than fifty today.
Driver, Harold (1936). Wappo Ethnography. University of California Publications in American Archaeology and Ethnology, 36. Berkeley.
Sawyer, Jesse O. (1978). "Wappo." In Handbook of North American Indians. Vol. 8, California, edited by Robert F. Heizer, 256-263. Washington, D.C.: Smithsonian Institution.