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World Maps

Map collection from University of Texas
http://www.lib.utexas.edu/maps/
A large number of maps of all countries - historic maps also included

Atlopedia
http://www.atlapedia.com
Maps and information on many countries

Navigation maps

Google Maps
http://maps.google.com/maps?tab=ml
Find your way with Google

National Geographic Map Machine
http://plasma.nationalgeographic.com/mapmachine/
Satellite, street maps and more in this online atlas.

Historic Maps and data

Hypercities
http://linuxdev.ats.ucla.edu/

Broer Map Library
http://www.broermapsonline.org/members/
Online Historic Maps from all over the world.

Historial Atlas of the 20th Century
http://users.erols.com/mwhite28/20centry.htm
Historical Atlas of the 20th Century - last updated in 2003, but the data included is worth having here.

Historic Maps for students and teachers
http://etc.usf.edu/maps/index.htm

Cloud Maps - figure out what they are maps of.
http://www.themorningnews.org/archives/diversions/cloud_of_atlases.php

Bodleian Library (oxford) Many historical maps)
http://www.bodley.ox.ac.uk/guides/maps/