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The Commonwealth's Official GIS Office, a division of the Executive Office of Environmental Affairs. Includes data downloads and free GIS resources.
Online mapping. Includes downloadable GIS data, plus special purpose GIS viewers such as several aerial photo viewers, a USGS topo map viewer, a census viewer, and environmental viewers.
The state's listing of geographical, political, recreation, healthcare, and environment maps and websites.
The Guide to Geographic Information Systems from the ESRI. What is GIS? Why use GIS? Case studies. Find data and resources.
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