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)
500 : Science
| 510 : Mathematics
| 520 : Astronomy
| 530 : Physics
| 540 : Chemistry
| 550 : Earth sciences & geology
| 560 : Fossils & prehistoric life
| 570 : Life sciences; biology
| 580 : Plants (Botany)
| 590 : Animals (Zoology)
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| 590 : Animals (Zoology) | 591 : Specific topics in natural history | 592 : Invertebrates | 593 : Marine & seashore invertebrates | 594 : Mollusks & molluscoids | 595 : Arthropods | 596 : Chordates | 597 : Cold-blooded vertebrates; fishes | 598 : Birds | 599 : Mammals |