| Term | Definition |
| Computer science, knowledge & systems | 000 |
| Bibliographies | 010 |
| Library & information science | 020 |
| Encyclopedias & books of facts | 030 |
| unassigned | 040 |
| Magazines, journals & serials | 050 |
| News media, journalism & publishing | 070 |
| Quotations | 080 |
| Manuscripts & rare books | 090 |
| Philosophy | 100 |
| Metaphysics | 110 |
| Epistemology | 120 |
| Parapsychology & occultism | 130 |
| Philosophical schools of thought | 140 |
| Psychology | 150 |
| Logic | 160 |
| Ethics | 170 |
| Ancient, medieval & eastern philosophy | 180 |
| Modern western philosophy | 190 |
| Religion | 200 |
| Philosophy & theory of religion | 210 |
| The Bible | 220 |
| Christianity & Christian theology | 230 |
| Christian practice & observance | 240 |
| Christian pastoral practice & religious orders | 250 |
| Christian organization, social work & worship | 260 |
| History of Christianity | 270 |
| Christian denominations | 280 |
| Other religions | 290 |
| Associations, organizations & museums | 060 |
| Social sciences, sociology & anthropology | 300 |
| Statistics | 310 |
| Political science | 320 |
| Economics | 330 |
| Law | 340 |
| Public administration & military science | 350 |
| Social problems & social services | 360 |
| Education | 370 |
| Commerce, communications & transportation | 380 |
| Customs, etiquette & folklore | 390 |
| Language | 400 |
| Linguistics | 410 |
| English & Old English languages | 420 |
| German & related languages | 430 |
| French & related languages | 440 |
| Italian, Romanian & related languages | 450 |
| Spanish & Portugese languages | 460 |
| Latin & Italic languages | 470 |
| Classical & modern Greek languages | 480 |
| Other languages | 490 |
| Science | 500 |
| Mathematics | 510 |
| Astronomy | 520 |
| Physics | 530 |
| Chemistry | 540 |
| Earth sciences & geology | 550 |
| Fossils & prehistoric life | 560 |
| Life sciences; biology | 570 |
| Plants (Botany) | 580 |
| Animals (Zoology) | 590 |
| Technology | 600 |
| Medicine & health | 610 |
| Engineering | 620 |
| Agriculture | 630 |
| Home & family management | 640 |
| Management & public relations | 650 |
| Chemical engineering | 660 |
| Manufacturing | 670 |
| Manufacture for specific uses | 680 |
| Building & construction | 690 |
| Arts | 700 |
| Landscaping & area planning | 710 |
| Architecture | 720 |
| Sculpture, ceramics & metal work | 730 |
| Drawing & decorative arts | 740 |
| Painting | 750 |
| Graphic arts | 760 |
| Photography & computer art | 770 |
| Music | 780 |
| Sports, games, & entertainment | 790 |
| Literature, rhetoric & criticism | 800 |
| American literature in English | 810 |
| English & Old English literatures | 820 |
| German & related literatures | 830 |
| French & related literatures | 840 |
| Italian, Romanian & related literatures | 850 |
| Spanish & Portugese literatures | 860 |
| Latin & Italic literatures | 870 |
| Classical & modern greek literatures | 880 |
| Other literatures | 890 |
| History | 900 |
| Geography & travel | 910 |
| Biography & genealogy | 920 |
| History of ancient world (to ca. 499) | 930 |
| History of Europe | 940 |
| History of Asia | 950 |
| History of Africa | 960 |
| History of North America | 970 |
| History of South America | 980 |
| History of other areas | 990 |