| 000 | Generalities |
| 010 | Bibliography |
| 020 | Library and information sciences |
| 030 | General encyclopedic works |
| 040 | [unassigned] |
| 050 | General serial publications |
| 060 | General organizations and museology |
| 070 | News media, journalism, publishing |
| 080 | General collections |
| 090 | Manuscripts and rare books |
| 100 | Philosophy and psychology |
| 110 | Metaphysics |
| 120 | Epistemology, causation, humankind |
| 130 | Paranormal phenomena |
| 140 | Specific philosophical schools |
| 150 | Psychology |
| 160 | Logic |
| 170 | Ethics (Moral philosophy) |
| 180 | Ancient, medieval, Oriental philosophy |
| 190 | Modern western philosophy |
| 200 | Religion |
| 210 | Philosophy and theory of religion |
| 220 | Bible |
| 230 | Christianity - Christian theology |
| 240 | Christian moral and devotional theology |
| 250 | Christian orders and local church |
| 260 | Social and ecclesiastical theology |
| 270 | History of Christianity and Christian church |
| 280 | Christian denominations and sects |
| 290 | Comparative religion and other religions |
| 300 | Social sciences |
| 310 | Collections of general statistics |
| 320 | Political science |
| 330 | Economics |
| 340 | Law |
| 350 | Public administration and military science |
| 360 | Social problems and services; association |
| 370 | Education |
| 380 | Commerce, communications, transportation |
| 390 | Customs, etiquette, folklore |
| 400 | Language |
| 410 | Linguistics |
| 420 | English and Old English |
| 430 | Germanic languages - German |
| 440 | Romance languages - French |
| 450 | Italian, Romanian, Rhaeto-Romanic |
| 460 | Spanish and Portuguese languages |
| 470 | Italic languages - Latin |
| 480 | Hellenic languages - Classical Greek |
| 490 | Other languages |
| 500 | Natural sciences and mathematics |
| 510 | Mathematics |
| 520 | Astronomy and allied sciences |
| 530 | Physics |
| 540 | Chemistry and allied sciences |
| 550 | Earth sciences |
| 560 | Paleontology - Paleozoology |
| 570 | Life sciences - Biology |
| 580 | Plants |
| 590 | Animals |
| 600 | Technology (Applied sciences) |
| 610 | Medical sciences - Medicine |
| 620 | Engineering and allied operations |
| 630 | Agriculture and related technologies |
| 640 | Home economics and family living |
| 650 | Management and auxiliary services |
| 660 | Chemical engineering |
| 670 | Manufacturing |
| 680 | Manufacture for specific uses |
| 690 | Buildings |
| 700 | The arts - Fine and decorative arts |
| 710 | Civic and landscape art |
| 720 | Architecture |
| 730 | Plastic arts - Sculpture |
| 740 | Drawing and decorative arts |
| 750 | Painting and paintings |
| 760 | Graphic arts - Printmaking and prints |
| 770 | Photography and photographs |
| 780 | Music |
| 790 | Recreational and performing arts |
| 800 | Literature and rhetoric |
| 810 | American literature in English |
| 820 | English and Old English literatures |
| 830 | Literatures of Germanic languages |
| 840 | Literatures of Romance languages |
| 850 | Italian, Romanian, Rhaeto-Romanic |
| 860 | Spanish and Portuguese literatures |
| 870 | Italic literatures - Latin |
| 880 | Hellenic literatures - Classical Greek |
| 890 | Literatures of other languages |
| 900 | Geography and history |
| 910 | Geography and travel |
| 920 | Biography, genealogy, insignia |
| 930 | History of ancient world to ca. 499 |
| 940 | General history of Europe |
| 950 | General history of Asia - Far East |
| 960 | General history of Africa |
| 970 | General history of North America |
| 980 | General history of South America |
| 990 | General history of other areas |