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National Geodetic Survey Data Explorer. at <http://www.ngs.noaa.gov/NGSDataExplorer/>

Scanned "newer" 1:25K topographic maps (from MassGIS). at <http://www.mass.gov/anf/research-and-tech/it-serv-and-support/application-serv/office-of-geographic- information-massgis/datalayers/imquad.html>

UNH Historic Map Library for New England. at <http://docs.unh.edu/nhtopos/nhtopos.htm>