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Library of Congress Classification System

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A system for classifying books and other works devised for the Library of Congress in Washington, D.C. which divides human knowledge into broad categories indicated by letters of the English alphabet, with further subdivisions indicated by decimal notation.

  • Sample call number: PN 2035.H336 1991


  • Classification by discipline
  • Economy of notation
  • Alphabetically and geographically transparent
  • Lots of room for growth


  • Piecemeal
  • Few mnemonic devices
  • No overall instructions
  • No overall index
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See also the Wikipedia article on:
Library of Congress Classification

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