Mabee, S. B. Brittle Structure Database of the Wilmington quadrangle, Massachusetts. Open-File Report (2009).

Castle, R. O., Hepburn, J. C. & Kopera, J. P. [Draft] Preliminary bedrock geologic map of the Lawrence quadrangle, Massachusetts. Open-File Report (2005).

Castle, R. O., Hepburn, J. C. & Kopera, J. P. [Draft] Preliminary bedrock geologic map of the Wilmington quadrangle, Massachusetts. Open-File Report (2005).

Massey, M. A. Progress map of the preliminary bedrock geologic map of the Billerica quadrangle, Massachusetts. (2011).

Jahns, R. H. & Kopera, J. P. Progress report of bedrock geologic mapping of the Lowell quadrangle, Massachusetts. Progress Map (2010).