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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 地图
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 地图
3
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 地图
4
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 地图
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