from their web page: "The National Historical Geographic Information System (NHGIS) is a project to create and freely disseminate a database incorporating all available aggregate census information for the United States between 1790 and 2015." Free… Read more.
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Maps included on this web site are of cities on all continents dating from 1200 through 1930s. Each map has bibliographic data and can be viewed in low or high-resolution as well as an alternate for Mr. Sid high-magnification A speciality of this… Read more.
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Online maps of Crown maps using both interactive and static digital maps. Static maps are in PDF format.
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Raster images of various maps. Many are country maps and others are region maps.
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Mineral Resources Data System (MRDS): MRDS describes metallic and nonmetallic mineral resources throughout the world. Included are deposit name, location, commodity, deposit description, geologic characteristics, production, reserves, resources, and… Read more.