Kopera, J. P. The Nashoba Terrane: A new tectonostratigraphy and shared structural styles with the Merrimack belt in Massachusetts. Geological Society of America Abstracts with Programs 47, 42 (2015).

Kopera, J. P. & Mabee, S. B. A new way of looking at, and mapping, bedrock; the hydrostructural domain map of the Ayer Quadrangle, northeastern Massachusetts. Abstracts with Programs - Geological Society of America 38, 166 - 166 (2006).

Kopera, J. P. & Massey, M. A. A structural framework for the Nashoba Terrane in eastern Massachusetts. Abstracts with Programs - Geological Society of America 45, 107 (2013).

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 Reading quadrangle, Massachusetts. Open-File Report (2005).