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Alan Turning: What Is Artificial Intelligence?
An article on expert systems can be found at this location which explains what expert systems are, lists some of the fields they're used in, the basic components of expert systems, and gives information on some real life expert systems...
Massachusetts Institute of Technology
Mit: Computer Science and Artificial Intelligence Laboratory
This site contains a variety of resources, information about, and research concerning artificial intelligence.
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Artificial Intelligence Depot
The Artificial Intelligence Depot resource contains general information and a listing of publications about artificial intelligence.