Robinson, P. Bedrock geologic map and cross sections of the Mt. Grace - Northfield area, Massachusetts and New Hampshire. (2011).

Robinson, P. Bedrock geologic map of the Belchertown 7.5? quadrangle, Hampshire County, Massachusetts. Open File Report

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).