Fernandez, M., Duncan, C. & Mabee, S. B. Well inventory of the Hudson quadrangle, Massachusetts. Well Inventory (2005).

Peck, J. A. Digital conversion of Peck, J.H., 1975, Preliminary bedrock geologic map of the Clinton quadrangle, Worcester County, Mass., U.S. Geological Survey Open File Report 75-658. Digital Conversion (2012).

Mabee, S. B. [Draft] Fracture characterization map of the Hudson quadrangle, Massachusetts. Open-File Report (2005).

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).