1. Database of the geologic map of North America, adopted from the map by J.C. Reed, Jr. and others (2005) Author/Creator: Garrity, Christopher P. Publication/Creation: Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2009 Resource Type: Map Edition: Version 1.0. Access & Availability: Loading
2. Global GIS database. North America Publication/Creation: [Flagstaff. AZ] : USGS, [2003?] Resource Type: Map Edition: Data only version. Access & Availability: Loading