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1
Aeromagnetic map of the Ashburnham quadrangle, Worcester and Middlesex Counties, Massachusetts, and Cheshire and Hillsborough Counties, New Hampshire /
Washington, D.C. : Department of the Interior, United States Geological Survey, 1971

Government Document Map
2
Aeromagnetic map of the Ashby quadrangle, Middlesex and Worcester Counties, Massachusetts, and Hillsborough County, New Hampshire /
Washington, D.C. : Department of the Interior, United States Geological Survey, 1971

Government Document Map
3
Aeromagnetic map of the Nashua South quadrangle, Middlesex County, Massachusetts, and Hillsborough County, New Hampshire /
Washington, D.C. : Department of the Interior, United States Geological Survey, 1971

Government Document Map
4
Aeromagnetic map of the Lawrence quadrangle, Essex and Middlesex Counties, Massachusetts, and Rockingham and Hillsborough Counties, New Hampshire /
Washington, D.C. : Dept. of the Interior, U.S. Geological Survey, 1970

Government Document Map
5
Aeromagnetic map of the Pepperell quadrangle, Middlesex County, Massachusetts, and Hillsborough County, New Hampshire /
Washington, D.C. : Department of the Interior, United States Geological Survey, 1971

Government Document Map
6
Aeromagnetic map of the Lowell quadrangle, Middlesex and Essex Counties, Massachusetts, and Hillsborough County, New Hampshire /
Washington, D.C. : Department of the Interior, United States Geological Survey, 1971

Government Document Map
7
Aeromagnetic map of the Townsend quadrangle, Middlesex and Worcester Counties, Massachusetts, and Hillsborough County, New Hampshire /
[Washington, D.C.] : Department of the Interior, U.S. Geological Survey, 1971

Government Document Map
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