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  • Dewey Browse
    Directory of web sites for K-12 students, organized by the Dewey Decimal System categories used by libraries. Also includes teacher resources.
  • Universal Decimal Classification Consortium
    Organization maintaining and promoting Universal Decimal Classification, a system of cataloging and indexing books and knowledge developed by Paul Otlet at the end of the 19th century.
  • Dewey, Melvil (1851-1931) (5)
  • Otlet, Paul (1868-1944) (6)
  • Ranganathan, Shiyali Ramamrita (1892-1972) (6)
  • Morton Grove Public Library - Webrary
    Directory of web sites arranged according to the Dewey Decimal System. Find online resources the way you would find books in a library, and browse categories like literature, religion, and science.
  • Dewey Guide
    Find the Dewey Decimal System numbers for the topics you're interested in with this table from the Appleton Public Library. Offers an alphabetical list of topics from A to Z.
  • How the Dewey Decimal System Works
    Breakdown of the Dewey Decimal System, the classification system used by libraries to organize books by topic. Includes an outline of the Dewey Decimal numbers. From Duke Libraries.
  • Wikipedia: Universal Decimal Classification
    Overview of Universal Decimal Classification, a method of large-scale library cataloging and indexing based on the Dewey Decimal system.
  • Wikipedia: Dewey Decimal Classification
    Overview of the Dewey Decimal Classification system, invented by Melvil Dewey to help libraries organize the books in their collections. Learn how the DDC works and how it has been developed by libraries today.
  • Was Ranganathan a Yahoo!?
    1998 article discussing the similarities between S.R. Ranganathan's Colon Classification, and the classification schemes used by web directories such as Yahoo!.
  • Excerpts from Prolegomena to Library Classification
    Selected definitions and principles for library and information science students from S.R. Ranganathan's Prolegomena to Library Classification.
  • Do the Dewey
    Learn about the Dewey Decimal System, used by libraries to organize books by their topic. Also includes information about the system's inventor, Melvil Dewey, and a quiz to test your knowledge.
  • Wikipedia: Bliss Bibliographic Classification
    Summary of the Bliss Bibliographic Classification, a system of library indexing and cataloging developed by Henry Evelyn Bliss. Includes history and examples.
  • Classification and Subject Index for Cataloguing and Arranging the Books and Pamphlets of a Library
    Online text of Melvil Dewey's original book introducing the Dewey Decimal System of library cataloging. In HTML and plain text. From Project Gutenberg.
  • Ranganathan and Facet Analysis
    Overview of the Colon Classification scheme of faceted library cataloging and categorizing, proposed by S.R. Ranganathan, and how Colon Classification is used in the Art and Architecture Thesaurus.
  • 025.431: The Dewey Blog
    One blog tackling everything you ever wanted to know about the Dewey Decimal System but were afraid to ask. Includes a Dewey Decimal Classification FAQ and posts categorized by their DDC number.
  • Dewey Decimal Classification Home Page
    Features history, news, and information on the classification system.
  • Universal Decimal Classification System
    Quick reference to the numerical subject headings used in the Universal Decimal Classification System, from 00 (Generalities) to 94 (History).

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