| 000 | Computer Sciences, Information and General Works |
 | | 010 Bibliography | 060 General Organizations and Museum Sciences |
| 020 Library and Information Sciences | 070 News Media, Journalism and Publishing |
| 030 General Encyclopedic Works | 080 General Collections |
| 040 Unassigned | 090 Manuscripts and Rare books |
| 050 General Serial Publication | |
| | | |
| 100 | Philosophy and Psychology |
 | | 110 Metaphysics | 160 Logic |
| 120 Epistemology | 170 Ethics |
| 130 Parapsychology and Occultism | 180 Ancient, Medieval and Eastern Philosophy |
| 140 Philosophical Schools of Thought | 190 Modern Western Philosophy |
| 150 Psychology | |
| | | |
| 200 | Religion |
 | | 210 Philosophy and Theory of Religion | 260 Christian Organization, Social Work and Worship |
| 220 The Bible | 270 History of Christianity |
| 230 Christianity and Christian Theology | 280 Christian Denominations |
| 240 Christian Practice and Observance | 290 Other Religions |
| 250 Christian Pastoral Practice and Religious Order | |
| | | |
| 300 | Social Sciences |
 | | 310 Statistics | 360 Social Problems and Social Services |
| 320 Political Science | 370 Education |
| 330 Economics | 380 Commerce, Communications and Transportation |
| 340 Law | 390 Customs, Etiquette and Folklore |
| 350 Public Administration and Military Science | |
| | | |
| 400 | Language |
 | | 410 Linguistics | 460 Spanish and Portuguese Languages |
| 420 English and Old English Languages | 470 Latin and Italic Languages |
| 430 German and Related Languages | 480 Classical and Modern Greek Languages |
| 440 French and Related Languages | 490 Other Languages |
| 450 Italian, Romanian and Related Languages | |
| | | |
| 500 | Science |
 | | 510 Mathematics | 560 Fossils and Prehistoric Life |
| 520 Astronomy | 570 Life Sciences; Biology |
| 530 Physics | 580 Plants (Botany |
| 540 Chemistry | 590 Animals (Zoology) |
| 550 Earth Sciences and Geology | |
| | | |
| 600 | Technology |
 | | 610 Medicine and Health | 660 Chemical Engineering |
| 620 Engineering | 670 Manufacturing |
| 630 Agriculture | 680 Manufacture for Specific Uses |
| 640 Home and Family Management | 690 Building and Construction |
| 650 Management and Public Relations | |
| | | |
| 700 | Arts and Recreation |
 | | 710 Landscaping and Area Planning | 760 Graphics Arts |
| 720 Architecture | 770 Photography and Computer Art |
| 730 Sculpture, Ceramics and Metalwork | 780 Music |
| 740 Drawing and Decorative Arts | 790 Sports, Games and Entertainment |
| 750 Painting | |
| | | |
| 800 | Literature |
 | | 810 American Literature in English | 860 Spanish and Portuguese Literatures |
| 820 English and Old English Literature | 870 Latin and Italic Literatures |
| 830 German and Related Literatures | 880 Classical and Modern Greek Literatures |
| 840 French and Related Literatures | 890 Other Literatures |
| 850 Italian, Romanian and Related Literatures | |
| | | |
| 900 | History and Geography |
 | | 910 Geography and Travel | 960 History of Africa |
| 920 Biography and Genealogy | 970 History of North America |
| 930 History and Ancient World (to ca. 499) | 980 History of South America |
| 940 History of Europe | 990 History of Other Areas |
| 950 History of Asia | |
