The DNR Bibliography of the Geology and Mineral Resources of Washington State is now on line and searchable with key words etc.
http://www2.wadnr.gov/dbtw-wpd/washbib.htm
Some one also made a list of every states geological survey sites. A lot of states have free or online publications that include geological maps (Utah for example has one of Capital Reef)
http://www.library.uiuc.edu/gex/StateSurveyPubs.html.
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