The Massachusetts DEP Hydrogeologic Information Matrix. at <http://www.mass.gov/eea/docs/dep/water/compliance/hydromat.pdf>

National Geologic Map Database. at <http://ngmdb.usgs.gov/>

Reading Maps with a Critical Eye: Becoming an Informed Map Reader. at <http://www.maine.gov/doc/nrimc/mgs/mapuse/informed/informed.htm>

USGS Publications Warehouse. at <http://infotrek.er.usgs.gov/pubs/>

What 7.5' quadrangle am I in?: A PDF of a paper map. at <http://www.geo.umass.edu/stategeologist/Quads_Towns_WS7_34x44.pdf>

What 7.5' quadrangle am I in?: KMZ of 7.5" quadrangles for use in Google Earth. at <http://www.geo.umass.edu/stategeologist/QuadTownsWatersheds.kmz>