Sources of Maps on the Web:
National Geographic Society Map Machine:Selection of contemporary maps.
Oddens’ Maps and Atlases: Easy-to-use, very large collection of country maps – many historic.
Perry Castaneda Map Library: Public-domain maps, mostly from the US Government.
CIA Maps: In both JPEG and PDF format. PDF maps print better.
The Guide to Maps and Mapping A good resource; with thanks to Jessica Young’s 4th grade class.