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1858. Harvard Map Collection, Harvard College Library, Chace, J., Custer, E., delineator., and Smith, Mason & Co. This layer is a georeferenced raster image of the historic paper map entitled: Map of Hillsboro Co., New Hampshire, from actual surveys by J. Chace... Harvard Map Collection, Harvard College Library.
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.
1816. Harvard Map Collection, Harvard College Library, Carrigain, Philip, 1772-1842., Barralet, John James, ca. 1747-1815., Harrison, William, ca. 1750-1803., and Gilman, John Taylor, 1753-1828, dedicatee. This layer is a georeferenced raster image of the historic paper map entitled: New Hampshire by recent survey : made under the supreme authority an... Harvard Map Collection, Harvard College Library.