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  2. National Historical Geographic Information System - Wikipedia

    en.wikipedia.org/wiki/National_Historical...

    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 ...

  3. Historical geographic information system - Wikipedia

    en.wikipedia.org/wiki/Historical_geographic...

    Large map collections, such as the David Rumsey Historical Map Collection, have digitized and georeferenced their maps and published them on the Internet, making them accessible for a variety of projects. Georeferencing historical microdata, such as census or parish records, allows researchers to conduct spatial analysis of historical data ...

  4. National Register Information System - Wikipedia

    en.wikipedia.org/wiki/National_Register...

    The National Register Information System (NRIS) is a database of properties that have been listed on the United States National Register of Historic Places.The database includes more than 84,000 entries of historic sites that are currently listed on the National Register, that were previously listed and later removed, or that are pending listing. [1]

  5. National Register of Historic Places listings in California

    en.wikipedia.org/wiki/National_Register_of...

    The following are approximate tallies of current listings in California on the National Register of Historic Places. These counts are based on entries in the National Register Information Database as of April 24, 2008, [1] and new weekly listings posted since then on the National Register of Historic Places web site. [2]

  6. National Register of Historic Places - Wikipedia

    en.wikipedia.org/wiki/National_Register_of...

    A property listed in the National Register, or located within a National Register Historic District, may qualify for tax incentives derived from the total value of expenses incurred in preserving the property. Properties can be nominated in a variety of forms, including individual properties, historic districts and multiple property submissions ...

  7. The National Map - Wikipedia

    en.wikipedia.org/wiki/The_National_Map

    The National Map is a significant contribution to the U.S. National Spatial Data Infrastructure (NSDI) from the Federal Geographic Data Committee (FGDC) and currently is being transformed to better serve the geospatial community by providing high quality, integrated geospatial data and improved products and services including new generation ...