Title: Aeromagnetic map of part of the Haverhill quadrangle, Essex County, Massachusetts, and Rockingham County, New Hampshire /
Authors: Geological Survey (U.S.); Massachusetts.
Publisher: The Survey,
Year: 1970
Subjects: Geomagnetism Massachusetts Essex County Maps.; Geomagnetism New Hampshire Rockingham County Maps.; Essex County (Mass.) Maps.; Rockingham County (N.H.) Maps.