U.S. Geological Survey. Geologic Division. Office of Mineral Resources. National-scale geologic map to support national and regional level projects, including mineral resource and geo-environmental assessments. The U.S.... U.S. Department of Agriculture.
U.S. Department of Commerce, U.S. Census Bureau, Geography Division. The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census... U.S. Department of Commerce, U.S. Census Bureau, Geography Division.
U.S. National Park Service. Contains the administrative boundaries of the United States' National Parks in the state of Colorado. U.S. National Park Service.