1813. Harvard Map Collection, Harvard Library, Lewis, Samuel, 1753 or 4-1822., Plowman, Thomas Lowry., Fairman, Gideon, 1774-1827., and Hooker, William, 1782-1856. This layer is a georeferenced raster image of the historic paper map entitled: A correct map of the United States with the West Indies : from the b... Harvard Map Collection, Harvard College Library.
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2016. Hart Energy Publishing. This point shapefile represents ports in the United States, Mexico, and Canada. Data includes official port name, entry restrictions, associated U.... Hart Energy Publishing.
2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This line shapefile represents roads in North America at 1:1,000,000 scale. The roads included in this layer are either those that connect major ce... Geological Survey (U.S.).
2016. Hart Energy Publishing. This line shapefile represents roads in North America (Canada, Mexico, and the United States). This layer is from Winter Quarter 2016. This layer i... Hart Energy Publishing.