Soil Surveys are paperbound publications containing text and soil maps. Each Soil Survey covers a county (e.g. Soil Survey of Gilliam County, Oregon). They are cataloged and listed in Portland State's online catalog and are shelved on the 5th Floor at the call # S591 .A22.
A table of contents for a typical Soil Survey looks like this:
Only those covering Washington, Oregon, Idaho, Montana, and Alaska are in the print collection. Online versions of the latest surveys are available through the USDA Natural Resources Conservation Service's Web Soil Survey site.