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Fernandez, M. Well Inventory of the Westford quadrangle, Massachusetts. Well Inventory (2009).

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Wise, D. U., Mabee, S. B. & Hardcastle, K. C. Preliminary Geology and Assessment of Groundwater Potential at Cresta de Sacramento, Palpa, Peru: Field Report ? July 2002. 31 (2003).

Boston Subsurface Project at Tufts University. at <http://bostonsoil.atech.tufts.edu/>

Geology Tours of National Parks. at <http://www2.nature.nps.gov/geology/tour/index.htm>

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SearchWell - MassDEP Well Driller Program. at <https://eeaonline.eea.state.ma.us/dep/searchwell/>

USGS Groundwater Watch. at <http://groundwaterwatch.usgs.gov/>

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