Geologic
National Geologic Map Database - Catalog (USGS) — http://ngmdb.usgs.gov/ngm-bin/ngm_compsearch.pl
National Geologic Map Database - State Map (USGS) — http://ngmdb.usgs.gov/ngmdb/ngm_SMsearch.html
Links to State Geological Surveys (AASG) — http://www.stategeologists.org/
USGS Publications Warehouse (USGS) — http://pubs.er.usgs.gov/
U.S. State Geologic Maps (About.com) — http://geology.about.com/od/stategeologicmaps/Geologic_Maps_of_the_US_States.htm
Digital Geologic Maps of US States (USGS) — http://tin.er.usgs.gov/geology/state/
TN Division of Geology Catalogue of Publications — http://www.tennessee.gov/environment/tdg/maps/pdf/cop.pdf
Tennessee Landforms (Tom Dunigan) — http://web.eecs.utk.edu/~dunigan/landforms/
TN Soil Surveys (UT Ag Vet Med Library) — http://www.lib.utk.edu/agvet/agriculture/worksheet.html
Geologic Atlas of the United States 1894-1945 (Texas A&M University) — http://repository.tamu.edu/handle/1969.1/2490
Historic Geology Maps (David Rumsey Map Collection) — http://www.davidrumsey.com/luna/servlet/view/all/what/Geology
Geologic Maps (USGS) — http://geomaps.wr.usgs.gov/parks/gmap/index.html
Introduction to Geologic Mapping-(NCGMP) — http://ncgmp.usgs.gov/geomaps/introgeo_mapping.html