Tag cloud of DDC level 1 topics
* Religion * * Science * * Technology * * Computer science, information & general works * * History & geography * * Social sciences * * Arts & recreation * * Literature * * Language * * Philosophy & psychology *
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The DDC (Dewey Decimal Classification) divides subjects into 10 topics at level 1. Each level 1 topic has 10 subdivision topics at level 2, and each subdivision is in turn divided into 10 topics at level 3.
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