This map was produced with Digital Line Graph (DLG) data available from the U.S. Geological Survey EROS Data Center.
U.S. Department of the Interior | U.S. Geological Survey
URL: https://geochange.er.usgs.gov/sw/resources/sw_basemap/
Page Maintainer: Randy Schumann
Page Last Modified: Fri 9-Dec-2016 14:28:28 MST