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/>

Kopera, J. P., Mabee, S. B. & Powers, D. C. Preliminary fracture characterization map of the Ayer quadrangle, Massachusetts. Open-File Report (2006).

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

Kopera, J. P. & Mabee, S. B. Preliminary field report on the November 13th-14th, 2011 landslide near Steam Mill Road, Deerfield, Massachusetts. Open File Report 19 (Massachusetts Geological Survey, 2011). at <http://www.geo.umass.edu/stategeologist/Products/reports/Deerfield_LS_Report_final.pdf>

Mabee, S. B. & Kopera, J. P. Preliminary field report on the Route 2 landslides of tropical storm Irene, August 28, 2011. 18 (Massachusetts Geological Survey, 2011). at <http://www.geo.umass.edu/stategeologist/Products/reports/Rt2_Irene_FieldReport.pdf>