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Tiger Map Server
http://tiger.census.gov/cgi-bin/mapbrowse-tbl?lat=42.384438&lon=-71.635634&wid=.1&ht=.1&
Interactive map of area, based on US census data.
UNH Dimond Library
http://docs.unh.edu/towns/BerlinMassachusettsMapList.htm
Historic USGS maps of the area.