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There are approximately zillions of specialized search engines out there, as can be seen at Search Engine Guide. The list below is a selective subset of these, chosen because they might help you find materials useful as resources in a WebQuest. All of these links lead to sites that contain specific information that may not turn up when you do a general search of the Web using Altavista, Yahoo, and other search engines and directories. For a more comprehensive list, you might also want to check the Invisible-Web site.