USGS 7.5 MIN TopoMaps (2000). This data set consists of images derived from scans of U.S.G.S. 7.5 minute quadrangle maps (Digital Raster Graphics). The images form a set of 4 seamless tiles, 5,000 m on a side for each map, from which the map collar information was removed. Images are GeoTIFF files in NAD83, UTM zone 18.
GeoSpatial Gateway (Hydrologic units, Topographic images, Map indexes (1/12k, 1/24k, 1/25k,1/100k,1 degree by state), Elevation (10 & 30 m), ortho imagry, Geographic names, land use land cover, Soils and Temperature)
Spatial data (Air, Air Quality, Chemikcals, Cleanup, Climate change, Hazardous waste, Health assesment, Health effects, Health risks,Monitoring, Pesticides, Soil & land, Surface water, Wastes, Watersheds, Water)
US Forest Service
FSGeodata Clearinghouse (Rster and Vector data for National Forests, Sate and Private Forestry Assessment Data, Forest Service maps, + other resources).