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1989. Geological Survey (U.S.). This layer is a digital raster graphic of the 30 x 60 Minute USGS topographic map of the Albany, New York quadrangle, 1989, covering also portions ... United States Geological Survey.
1986. Geological Survey (U.S.). This layer is a digital raster graphic of the 30 x 60 Minute USGS topographic map of the Keene, New Hampshire quadrangle, 1986, covering also porti... United States Geological Survey.