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

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 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).

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/>

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