Fernandez, M., Duncan, C. & Mabee, S. B. Well Inventory of the Ayer quadrangle, Massachusetts. Well Inventory (2006).

Fernandez, M. Well Inventory of the Westford quadrangle, Massachusetts. Well Inventory (2009).

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

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).

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