More than 50,000 historical digitized maps are now available online at http://infoweb.newsbank.com/?db=SSMAP. The original maps are part of the U. S. Congressional Serial Set and they include a broad range of themes and cover from the early 1800′s to about the 1950′s. Early maps were created by expeditions that surveyed the American west, Alaska, and other parts of the world, as well as early surveys of cities, harbors and other geographic features for most of the country. Among the maps of local interest are a 1904 soil survey of Addison County and maps of Silver Lake, Lake Dunmore, and Otter Creek. Other maps provide detail of specific battles in the Civil War and some early city plans. Although the maps may be of greatest interest to geography majors, they may also be useful in supporting student research in geology, American history, and ethnic studies, among other disciplines.