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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1947. Schultz, Kenneth A. This polygon shapefile represents areas that were the subject of interstate territorial disputes between 1947 and 2000. The disputed areas referenc... Stanford Digital Repository.