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Back in the day of phyiscal card catalogs, each book would have at least one card in each index, to give searchers a variety of entry points into the index. For example, the book Godel Escher Bach by Douglas Hofstadter would have a total of eight cards:

Title: Godel Escher Bach

Author: Hofstadter, Douglas 1945-

Subjects:

  • Metamathematics
  • Symmetry
  • Artificial Intelligence
  • Bach, Johann Sebastian 1685-1750
  • Escher, Maurits Cornelis 1898-1971
  • Godel, Kurt
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12y ago

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