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Grinnell College Libraries
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GIS Data and Maps
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Demographics
Environment and Climate
Historical Data
Biology
Non-georeferenced Maps
Web-based GIS/Interactive Map Tools
Historical Data
National Historical Geographic Information System (NHGIS)
NHGIS provides aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2000. Free registration required.
Digital Atlas of Roman and Medieval Civilizations
GIS files from Harvard University.
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