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1988. Geological Survey (U.S.). This layer is a digital raster graphic of the 7.5 x 15 Minute USGS topographic map of the Athol, Massachusetts quadrangle, 1988. Scale 1:25,000. Th... United States Geological Survey.
1887. Harvard Map Collection, Harvard College Library. This layer is a digital raster graphic of the historic 15-minute USGS topographic quadrangle map of Barre, Massachusetts. The suvery (ground condit...
1988. Geological Survey (U.S.). This layer is a digital raster graphic of the 7.5 x 15 Minute USGS topographic map of the Barre, Massachusetts quadrangle, 1988. Scale 1:25,000. Th... United States Geological Survey.
1989. Geological Survey (U.S.). This layer is a digital raster graphic of the 30 x 60 Minute USGS topographic map of the Holyoke, Massachusetts quadrangle, 1989. Scale 1:100,000. ... 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.
1887. Harvard Map Collection, Harvard College Library. This layer is a digital raster graphic of the historic 15-minute USGS topographic map of the Winchendon, Massachusetts quadrangle. The survey date ...