USGS · gp716
Aeromagnetic map of the Lawrence quadrangle, Essex and Middlesex Counties, Massachusetts, and Rockingham and Hillsborough Counties, New Hampshire
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Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey. 1970. Aeromagnetic map of the Lawrence quadrangle, Essex and Middlesex Counties, Massachusetts, and Rockingham and Hillsborough Counties, New Hampshire. https://doi.org/10.3133/gp716
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