National Historical Geographic Information System
The National Historical Geographic Information System (NHGIS) is a historical GIS project to create and freely disseminate a database incorporating all available aggregate census information for the United States between 1790 and 2010. The project has created one of the largest collections in the world of statistical census information, much of which was not previously available to the research community because of legacy data formats and differences between metadata formats. In addition, NHGIS has created cartographic boundary files compatible with every census, and over 50 million lines of metadata describing the collection. The statistical and geographic data are disseminated free of charge through a sophisticated online data access system.
- Catherine Fitch and Steven Ruggles, “Building the National Historical Geographic Information System.” Historical Methods 46(2003): 41-51
See also 
- Project homepage
- Citations of the project in Google Scholar
- Historical Geographic Information Systems Online Forum on Google
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