Search the Library Catalog for more resources. Many USGS publications are available in Government Documents on the first floor of Memorial Library, at the University of Minnesota Twin Cities campus, or via interlibrary loan.
Comprises selected resources from "17 U.S. government science organizations within 12 Federal agencies. These agencies form the voluntary Science.gov Alliance. Visitors to the site can search across Alliance agency resources via one query...Two major types of information are included — selected authoritative science Web sites and often hard-to-access scientific databases."
Part of the virtual geology project at the University of North Carolina, this site has numerous examples of microscopic thin section images of minerals.
Contains bibliographic citations for over 70,000 publications (many full-text), full product and thematic map content for over 40,000 publications and the USGS numbered series from 1880. Excellent place to begin your research.