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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 Ayer, Massachusetts quadrangle, 1988. Scale 1:25,000. The... United States Geological Survey.
1987. Geological Survey (U.S.). This layer is a digital raster graphic of the 7.5 x 15 Minute USGS topographic map of the Billerica, Massachusetts quadrangle, 1987. Scale 1:25,000... United States Geological Survey.
Harvard Map Collection, Harvard Library and Metropolitan Area Planning Council (Boston, Mass.). This layer is a georeferenced raster image of the historic paper map entitled: Metroplan 2000 : definitive transpo[rtation] map / Metropolitan Area... Harvard Map Collection, Harvard Library.
1828. Harvard Map Collection, Harvard College Library and Butler, Caleb, 1776-1854. This layer is a georeferenced raster image of the historic paper map entitled: A map of the town of Groton, Middlesex County, Mass. : from a survey... Harvard Map Collection, Harvard College Library.
1887. Harvard Map Collection, Harvard College Library. This layer is a digital raster graphic of the historic 15-minute USGS topographic map of the Groton, Massachusetts quadrangle. The survey date (gro...
Harvard Map Collection, Harvard Library and Metropolitan Area Planning Council (Boston, Mass.). This layer is a georeferenced raster image of the historic paper map entitled: Metroplan 2000 :[level of service map] / Metropolitan Area Planning ... Harvard Map Collection, Harvard Library.
1886. Harvard Map Collection, Harvard College Library. This layer is a digital raster graphic of the historic 15-minute USGS topographic map of the Lowell, Massachusetts quadrangle. The survey date (gro...
1987. Geological Survey (U.S.). This layer is a digital raster graphic of the 7.5 x 15 Minute USGS topographic map of the Lowell, Massachusetts quadrangle, 1987. Scale 1:25,000. T... United States Geological Survey.
1988. Geological Survey (U.S.). This layer is a digital raster graphic of the 30 x 60 Minute USGS topographic map of the Lowell, Massachusetts quadrangle, 1988. Scale 1:100,000. I... United States Geological Survey.
1856. Harvard Map Collection, Harvard College Library and Walling, Henry Francis, 1825-1888. This layer is a georeferenced raster image of the historic paper map entitled: Map of Middlesex County, Massachusetts, the details from original su... Harvard Map Collection, Harvard College Library.