Title: Aeromagnetic map of the Townsend quadrangle, Middlesex and Worcester Counties, Massachusetts, and Hillsborough County, New Hampshire /
Authors: Geological Survey (U.S.); Massachusetts.
Publisher: The Survey,
Year: 1971
Subjects: Geomagnetism New Hampshire Hillsboro County Maps.; Geomagnetism Massachusetts Worcester County Maps.; Geomagnetism Massachusetts Middlesex County Maps.; Hillsborough County (N.H.) Maps.; Worcester County (Mass.) Maps.; Middlesex Couty (Mass.) Maps.