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

Kopera, J. P., DiNitto, R. G. & Hepburn, J. C. Bedrock geologic map of the Marlborough quadrangle, Massachusetts. geologic Map (2004).

Thompson, M. D. Bedrock geologic map of the Newton 7.5? quadrangle, Middlesex, Norfolk and Suffolk counties, Massachusetts. Geologic Map

W., D. & M., F. [Digital Conversion] Bedrock geologic map of the Gloucester and Rockport quadrangles, Massachusetts. Digital Conversion (2007).

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

Barosh, P. J. [Draft] Preliminary bedrock geologic map of the Oxford quadrangle, Worcester County, Massachusetts, Providence County, Rhode Island and Windam County, Connecticut. Open File Report (2005).

Castle, R. O., Hepburn, J. C. & Kopera, J. P. [Draft] Preliminary bedrock geologic map of the South Groveland 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).

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

Kopera, J. P. Preliminary Bedrock Geologic Map of the area surrounding Shepley's Hill, Towns of Ayer and Devens, Massachusetts. Open-File Report (2008).

Kopera, J. P. Preliminary bedrock geologic map of the Ayer quadrangle, Massachusetts. Open-File Report (2006). at <http://www.geo.umass.edu/stategeologist/>

Kopera, J. P. & Hansen, W. R. Preliminary Bedrock Geologic Map of the Hudson 7.5' Quadrangle Worcester and Middlesex Counties, Massachusetts. Open File Report (2014).

Kopera, J. P. & Hansen, W. R. Preliminary bedrock geologic map of the Hudson quadrangle, Massachusetts. Open-File Report (2005).

Kopera, J. P., Shaw, C. E. & Fernandez, M. Preliminary bedrock geologic Map of the Milford quadrangle. Open-File Report (2007).

Robinson, P. & Fernandez, M. Preliminary bedrock geologic map of the Orange 7.5' quadrangle, Massachusetts (including portions of the Millers Falls and Athol 7.5' quadrangles). Open File Report (2008).

Massey, M. A. Preliminary bedrock geologic Map of the Palmer quadrangle, Massachusetts. Open-File Report (2008).

Barosh, P. J. Preliminary bedrock geologic Map of the Webster quadrangle, Massachusetts. Open-File Report (2009).

Kopera, J. P., Alvord, D. C., Jahns, R. H., Willard, M. E. & White, W. S. Preliminary bedrock geologic map of the Westford quadrangle, Massachusetts. Open-File Report (2009).

Kopera, J. P. & Shaw, C. J. Preliminary bedrock Geology of the Northern Portion of the Blackstone quadrangle, Massachusetts. Open-File Report (2008). at <http://www.geo.umass.edu/stategeologist/>

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).

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

 U-Mass Geoscience Contribution Series. U-Mass Geoscience Publication Series (1978). at <http://www.geo.umass.edu/research/list.html>

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