Cornell's Digital Earth   - Use this interactive atlas to create maps displaying land, oceans, borders, roads, lakes, rivers, roads, railroads, faults, mines, seismic, and other geological, geographical, and geophysical data. Requires Java. - http://atlas.geo.cornell.edu/webmap/ 
United States Library of Congress Map Collections   - Top-level categories include cities and towns, cultural, landscapes, conservation and environment, military battles and campaigns, discovery and exploration, transportation and communication. Searchable by keyword, location, creator, subject, and title. - http://memory.loc.gov/ammem/gmdhtml/ 
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