Commemorating 200 years since Meriwether Lewis and William Clark embarked on their pioneering expedition throughout North America, ESRI, a maker of geographic information systems (GIS) software, has developed a new web site called "Lewis and Clark 200." The site provides an introduction to modern techniques of exploration, as well as a detailed history of mapmaking--from the tools first used by the famous pair's Corps of Discovery to more recent cartographic methods such as GIS, a computer-based tool for mapping and analyzing places and events. What's more, the web site offers many resources for geographic study,...

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