What Do Maps Show?
The U.S. Geological Survey has provided this online teaching package (appropriate for
upper elementary and junior high school classes) on understanding and using maps.
The site contains four 30-minute lesson plans, including maps and reproducible
activity sheets, and other USGS materials for classroom use.
The Perry-Castañeda Library Map Collection
Check out this extensive collection of maps. Print or download hundreds of high quality, copyright-free maps of nations and cities, as well as many historical maps. A special "Electronic Maps of Current Interest" section highlights maps of places in the newsgreat for enhancing current events lessons.
You can use the maps at this site as base maps for creating new thematic maps.