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Maps - US
Links to general, historical and topographic maps and other raster maps as well as interactive atlases.
WMS links for use with Esri ArcGIS or Google Earth
The following links will provide instructions on how to connect to that Agency's Web Mapping Service while using Esri's ArcGIS software or for Google Earth.
GIS Data - Nation-wide GIS Clearinghouses
Sources for national and international geospatial data
Interactive mapping tool that also allows downloading of maps in .SHP file format for use in ArcGIS.