2004. DeLorme Publishing Company, Inc. and Economic and Social Research Institute (Reston, Va.). World Airports is a point theme representing the airports of the world. ESRI.
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2010. DeLorme Publishing Company, Inc. and Economic and Social Research Institute (Reston, Va.). World Railroads is a line theme representing the railroads of the world. ESRI.
2010. DeLorme Publishing Company, Inc. and Economic and Social Research Institute (Reston, Va.). World Roads is a line theme representing the major roads and ferries of the world. ESRI.