| Ayer |
|---|
GP741 Aeromagnetic map of the Ayer Quadrangle, Middlesex and Worcester
Counties, Massachusetts. 1971
1:24,000.
GQ0021 Surficial geology of the Ayer Quadrangle, Massachusetts. 1953
1:31,680.
HA276 Water resources of the Nashua and Souhegan River basins, Massachusetts.
1977 1:48,000.
HA662 Hydrology and water resources of tributary basins to the Merrimack
River from Salmon Brook to the Concord
River, Massachusetts. 1985 1:48,000.
MF957 Bedrock geologic map of the Pepperell, Shirley, Townsend quadrangles
and part of the Ayer quadrangle, Massachusetts. 1978. 1:24,000.