GP731 Aeromagnetic map of the Townsend Quadrangle, Middlesex and
Worcester Counties, Massachusetts, and
Hillsborough County, New Hampshire. 1971 1:24,000.
GQ1677 Surficial geologic map of the Townsend Quadrangle, Middlesex
and Worcester Counties, Massachusetts, and
Hillsborough County, New Hampshire. 1990 1:24,000.
HA276 Water resources of the Nashua and Souhegan River basins, Massachusetts.
1977 1:48,000.
MF957 Bedrock geologic map of the Pepperell, Shirley, Townsend quadrangles
and part of the Ayer quadrangle, Massachusetts. 1978. 1:24,000.
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