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  • The contents of these are not freely available: libraries and corporations
    buy the rights for their authorized users to view the contents. If they appear
    free, it's because you are somehow authorized to search and read the contents
    (library card holder, member of the company, etc.).
  • in addition to what you find in search engine results (including
    Google Scholar) and most web directories,
    there are these gold mines you have to search directly. This includes all of
    the licensed article, magazine, reference, news archives, and other research
    resources that libraries and some industries buy for those authorized to use
    them.
  • 4 more annotations...
  • • In some experiments conducted at UC
      Berkeley, we estimate that Google Scholar accesses about 10% of all
      we subscribe to for our students, faculty, staff, and users present
      on campus. Think about the millions of articles in Lexis/Nexis, the
      many thousands of articles indexed in privately licensed databased
      libraries buy the rights for their users to read (e.g., Sociological
      Abstracts, ERIC, PscyhInfo, JSTOR, INSPEC). At Berkeley we subscribe
      ot about 200 of these.
    • Google
      Scholar is only able to provide citations to journal contents for
      which its crawlers can find stable llinks. It cannot construct searches
      or enter passwords to go into passworded, copyright-protected articles
      in many publishers' databases.
    • If access to a web pages requires typing,
      web crawlers encounter a barrier they cannot go beyond. They cannot search
      our online catalogs and they cannot enter a password or login.
    • Rarely are such pages stored anywhere:
      it is easier and cheaper to dynamically generate the answer page for each
      query than to store all the possible pages containing all the possible
      answers to all the possible queries people could make to the database.
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  • The "visible web" is what you see in the results pages from general web search engines. It's also what you see in almost all subject directories. The "invisible web" is what you cannot retrieve ("see") in the search results and other links contained in these types of tools.
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  The "invisible web" is what you cannot retrieve ("see") in the search results and other links contained in these types of tools.

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Page Comments

• 
  hg ye on 2008-03-12
  不能被SE发现的Internet数据叫做Invisible Web，或者叫Deep Web

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