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