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.
1994. Vanderbilt Engineering Center for Transportation Operations and Research, Vanderbilt University. The National Waterway Network is a comprehensive network database of the nation's navigable waterways. The data set covers the 48 contiguous States... U.S. Army Corps of Engineers Navigation Data Center.
1994. Vanderbilt Engineering Center for Transportation Operations and Research, Vanderbilt University. The National Waterway Network is a comprehensive network database of the nation's navigable waterways. The data set covers the 48 contiguous States... U.S. Army Corps of Engineers Navigation Data Center.