Geologic map of the Willamette Basin, Oregon from
Walker, G.W., and MacLeod, N.S., 1991, Geologic map of Oregon:
U.S. Geological Survey, scale 1:500,000, 2 sheets. (Created by State
Service Center for Geographic Information Systems, Information
Resources Management Division, Department of Administrative Services,
State of Oregon).
Report:
Report: Ground-Water and Water-Chemistry Data for the Willamette Basin,
Oregon
Willamette
Basin Ground-Water project page
Oregon District Home Page