GP742 Aeromagnetic map of the Westford Quadrangle, Middlesex County,
Massachusetts. 1971 1:24,000.
HA312 Water resources of the Assabet River basin, central Massachusetts.
1969 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.
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