%0 Journal Article
%J University of California Archaeological Survey, Report 54
%D 1961
%T Trade routes and economic exchange among the Indians of California.
%A Davis, J. T.
%P 1-71
%Z Ericson  (1982:136) describes a situation in California’s Napa Valley where the Saint Helena obsidian source fell within the territory of the Wappo ethnic group and the Wappo were,  in turn, surrounded by the Lake Miwok, Coast Miwok, Wintun and Pomo groups (Kroeber 1925). It is reported that in exchange for obsidian the Wappo received items such as bows, beads, shells, mats, fish, headbands, and clams It is not known whether the neighboring groups were able to negotiate direct access to the source (Davis 1961).