T. Dale, N. The commercial granites of New England. 448 (United States Geological Survey, 1923). at <https://pubs.er.usgs.gov/publication/b738>

Denny, C. S. Geomorphology of New England. USGS Professional Paper 18 (U.S. Geological Survey, 1982). at <https://pubs.er.usgs.gov/publication/pp1208>

Digital Versions of Older NEIGC Guidebooks (1920-1989). at <http://www.library.unh.edu/digital/category/science-technology>

Historical Cadastral Maps and Illustrations. at <http://www.historicmapworks.com/>

NEIGC Fieldtrip guidebooks for various parts of New England. at <http://w3.salemstate.edu/ lhanson/NEIGC/Guidebooks.html>

The U-Mass Geosciences publication series. at <http://www.geo.umass.edu/dept_info/contrib_series/list.html>

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