USGS · gp726
Aeromagnetic map of the Mount Grace quadrangle and part of the Northfield quadrangle, Franklin and Worcester Counties, Massachusetts, and Cheshire 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 Mount Grace quadrangle and part of the Northfield quadrangle, Franklin and Worcester Counties, Massachusetts, and Cheshire County, New Hampshire. https://doi.org/10.3133/gp726
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