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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| 560 : Paleontology; paleozoology | 561 : Paleobotany; fossil microorganisms | 562 : Fossil invertebrates | 563 : Fossil marine & seashore invertebrates | 564 : Fossil mollusks & molluscoids | 565 : Fossil arthropods | 566 : Fossil chordates | 567 : Fossil cold-blooded vertebrates; fossil fishes | 568 : Fossil birds | 569 : Fossil mammals |