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Guide to Dewey Decimal Classification

Understanding the Dewey Decimal Classification system which is used to organise books in the Library.

900 Geography & History

Class 900 is devoted primarily to history and geography. It also includes biography and genealogy.

  • 910 Geography & travel
  • 920 Biography & genealogy
  • 930 History of ancient world (to ca. 499)
  • 940 History of Europe
  • 950 History of Asia
  • 960 History of Africa
  • 970 History of North America
  • 980 History of South America
  • 990 History of other areas

NOTE: Some deviations from above are used by the Library, notably 490 for Irish language and 828.99 for Anglo-Irish literature. Please consult the catalogue for more details