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.
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1991. Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile contains the boundaries for Canada, Mexico, Greenland, the Dominican Republic, Cuba, Haiti, the Bahamas and Jamaica. This la... Environmental Systems Research Institute (Redlands, Calif.).