USGS · gp730
Aeromagnetic map of the Ashby quadrangle, Middlesex and Worcester Counties, Massachusetts, and Hillsborough County, New Hampshire
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Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey. 1971. Aeromagnetic map of the Ashby quadrangle, Middlesex and Worcester Counties, Massachusetts, and Hillsborough County, New Hampshire. https://doi.org/10.3133/gp730
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