Tag cloud of DDC level 2 topics for Science
* Physics * * Life sciences; biology * * Fossils & prehistoric life * * Animals (Zoology) * * Science * * Earth sciences & geology * * Plants (Botany) * * Mathematics * * Chemistry * * Astronomy *
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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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