USGS · gp729
Aeromagnetic map of the Ashburnham quadrangle, Worcester and Middlesex Counties, Massachusetts, and Cheshire and Hillsborough Counties, New Hampshire
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Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey. 1971. Aeromagnetic map of the Ashburnham quadrangle, Worcester and Middlesex Counties, Massachusetts, and Cheshire and Hillsborough Counties, New Hampshire. https://doi.org/10.3133/gp729
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