Maps

Historical Maps:

Historical Atlas of the 20th Century  includes information on socio-economic trends, systems of government, wars and religion.

Panoramic Maps (1847-1929) -  Nonphotographic representations of cities portrayed as if viewed from above at an oblique angle, from the late 19th and early 20th centuries.

David Rumsey Collection - Focuses on 18th and 19th century North and South American cartographic materials.

United States Maps:

United State Geological Survey - http://www.usgs.gov

Earthshots: Satellite Images of Environmental Changes - http://earthshots.usgs.gov/earthshots/

TopoZone - http://www.topozone.com

World Maps:

All the World Maps (EmbasssyWorld) - http://www.embassyworld.com/maps/maps.html 

Provides access to national maps and maps pinpointing major cities for countries.

Perry-Castaneda Maps library - http://www.lib.utexas.edu/maps/index.html 

Great site for maps.  Maps of current and general interest.

HRW World Maps - http://go.hrw.com/atlas/norm_htm/world.htm 

Continent/World Region maps

Access to political and physical maps and information for anywhere in the world by the National Geographic Society.

United Nations (Cartographic Section) - http://www.un.org/Depts/Cartographic/english/htmain.htm 

General country and special issues maps.