All database records are divided up into fields. Almost all search engines in CD-ROM or online library products and the more sophisticated Web search engines allow users to search for terms appearing in a particular field. This can help immensely when you're looking for a very specific item. Say that you're looking for a psychology paper by a professor from the University of Michigan and all you remember about the paper is that it had something about Freud and Jung in its title. If you think it may be on the Web, you can do a search in Alta Vista, searching for Freud AND Jung and limit your search to the umich.edu domain, which gives you a pretty good chance of finding it, if it's there.
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