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U.S. Geological Survey,
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Massachusetts
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1. Ground-water levels on Boston Peninsula, Massachusetts
Cotton, John E. U.S. Geological Survey,.
2. Massachusetts, 7.5 minute series (topographic)
Geological Survey (U.S.). U.S. Geological Survey,.
3. Surficial geology of the Ashburnham quadrangle, Hillsborough and Cheshire counties, New Hampshire /
Hildreth, C. T., cartographer. U.S. Geological Survey,.