This journal article from Reference Services Review
discusses electronic maps. The article lists web sites for online maps
but also talks about how to save and use the maps you find. You should
find most if not all of the sites listed in the article in our online
catalog or annotated below.
An additional, specialized search module for the Readex U.S. Congressional Serial Set, Serial Set Maps allows users to focus searches on the maps themselves - the geographic areas they depict, the subjects they represent, their titles, and the names associated with the maps either as cartographers, explorers, or in some other capacity.