This site provides access to various maps and general geography information. The Geology page contains similar information, as well as links to Geologic Maps of the States and a variety of other Earth Science Maps.
Geologic Maps of the States

This site provides links to official state home pages for each of the fifty United States.

USGS Scientific Investigations Report 2006-5139 covering the impact of weather on wildfires. Explores and links climate and wildfire conditions. The full report is available in PDF format.

Access the following types of state maps: shaded relief, county, black and white, satellite image, map showing a state in 1895, and a PostScript map.

This site provides maps that show county demarcations for each of the fifty states.

Earth Explorer is a product of the US Geological Survey containing downloads of DOQQ'S (digital aerial photography), the National Elevation Dataset, Digital Line Graph data, as well as other Satellite imagery for the lower 48 states. These are free digital products. Just log in as Guest for access.

This site offers United States, California, and major city atlases. Some map topics include population and race, ancestry, income and poverty, and adult educational attainment.

This site, "provides searching, accessing and dynamic mapping of data for federal land stewardship, land and mineral use records from BLM's LR2000, and land survey information." Pages are available for; Land and Mineral Use Records, Federal Land Stewardship, and Land Survey Information. Maps have options for adding layers and zooming in and out, and searching by place name.

GIS.com provides information, data, and supplies relating to geographic information systems: American FactFinder, The Atlas of Canada, The National Atlas of the United States, ZIP Code Fast Facts, Countrywide mapping, and various information regarding GIS. The site is sponsored by ESRI.

This resource offers information about the development of the atlas, the ability to create United States maps, and maps pertaining to the environment and other aspects of the United States.

The National Resources Conservation Service provides free downloadable soil survey manuscripts and maps related to the United States and Caribbean Area.
Online Soil Survey Manuscripts

The National Snow and Ice Data Center provides comprehensive data about the polar regions, including up-to-date research, historical information, news, and reports on current research. The site also provides extensive images, including satellite images of the polar regions.

These maps provide information about the percentage of the popular vote and electoral vote distribution in each of the fifty states for every presidential election since 1860.

The USGS DEMs in ArcView GIS site provides instructions for and a demonstration on using United States Geological Survey SDTS formatted data. The site also provides links to free downloads of a SDTS2DEM translator provided by Gregg Townsend, staff scientist at the University of Arizona.

the USGS Water-Resources Reports site provides extensive publications about water resosurces in the United States: circulars, data series, fact sheets, hydrological atlases, open-file reports, professional papers, scientific investigations maps and reports, water data reports, water supply papers, water errata sheets, and other publications. links to related sites are also provided.