The Harvard Map Collection contains one of the world’s finest collections of maps. Although their atlases are in HOLLIS, many of their individual maps are not. Som a visit is useful. As well as political and topographic maps, they have numerous thematic maps which map demographic, social, and economic other features.
Atlascope offers overlays of historic maps onto modern map of Boston and immediate suburbs.
Map History / History of Cartography
CartoMundi is an international collective catalogue offering about 35 000 citations for cartographic documents held in about 20 map libraries. Also includes over 2500 digital reproductions representing Europe and Mediterranean countries.
David Rumsey Historical Map Collection
IEG-MAPS: Server for Digital Historical Maps (Institut für europäische Geschichte - Mainz)
Periodis Web - A Historical Atlas and Gazetteer of Europe from Year 1 to 2000
Perry-Castañeda Library Map Collection
Map History / History of Cartography - WWW-Virtual Library
Histoire de la cartographie Bibliothèque Nationale de France exhibit
John Carter Brown Library Digital Collections
Barry Lawrence Ruderman Antique Maps (commercial site with well-annotated images)