Nevada Bureau of Mines & Geology
• Maps & Data
Oregon Department of Geology and Mineral Industries
• Publications
• Index to Geologic Maps of Oregon by USGS Topographic Quadrangle Name, 1883-1996 University of Oregon Libraries
Washington Geological Survey
• Geologic Maps
• Publications and Maps
Links to State Geological Surveys Association of American State Geologists
Most have lists of and/or links to their geological maps
List of U.S. Geological Survey Geologic and Water-Supply Reports and Maps for [various states]
Digitized versions via Hathitrust:
Geologic Map Index of [various states] (USGS)
Search OneSearch-Books & Media to find the call number.