B704 Geology of the igneous rocks of Essex County, Massachusetts.
1920.
GP712 Aeromagnetic map of part of the Salem Depot Quadrangle, Rockingham
County, New Hampshire, and Essex
County, Massachusetts. 1970 1:24,000.
HA616 Hydrology and water resources of the lower Merrimack River
basin, Massachusetts, from Concord River,
Lowell, to Plum Island, Newburyport. 1980 1:48,000.
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