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USDA Geospatial Data Gateway - One Stop Source for environmental and natural resources data. Choose your area of interest, browse and select data. Customize the format, and have it downloaded or shipped on CD or DVD
Worldwide
EarthWorks - Stanford's EarthWorks allows you to search the digital data and scanned map libraries of several different institutions
Geospatial Data Gateway - access to a map library of over 100 high-resolution vector and raster layers in the Geospatial Data Warehouse