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Dewey Decimal Classification (DDC) : 900

First Summary (The Ten Main Classes)

000 : Computers, information, & general works
100 : Philosophy & psychology
200 : Religion
300 : Social sciences
400 : Language
500 : Science
600 : Technology
700 : Arts & recreation
800 : Literature
900 : History & geography

Second Summary (The Hundred Divisions)

900 : History
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


Third Summary (The Thousand Sections)

900 : History & geography
901 : Philosophy & theory
902 : Miscellany
903 : Dictionaries & encyclopedias
904 : Collected accounts of events
905 : Serial publications
906 : Organizations & management
907 : Education, research & related topics
908 : Kinds of persons treatment
909 : World history