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GIS Data

Imagery and geospatial data sources that can be used in GIS and mapping projects.
Geospatial data sets (e.g., shapefiles) of land and marine boundaries. Data sets include historical and contemporary coverage of administrative and political units, school districts, marine areas, etc. Sources are organized by their area of geographic focus.

Boundary Data by Region

Global

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United States

U.S. Historical Data

Massachusetts

Canada