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Maps and Atlases

United States

Census Maps
Atlas of the Historical Geography of the United States
New York Public Library's Open Access Digitized Map Collection
Includes mostly New York maps, but has some maps from other locations
U. S. Topographical Maps
U. S. Historical Topographic Maps
U. S. Geological Survey store
Rand McNally
U. S. Contemporary Maps (including themes) - Alabama Maps website
National Historical Geographical Information System (NHGIS)
"The National Historical Geographic Information System (NHGIS) provides population, housing, agricultural, and economic data, along with GIS-compatible boundary files, for geographic units in the United States from 1790 to the present." (from the website)