Dewey Decimal System (up to 2nd Classification)

000 – Computer science, information & general works
 000 Computer science, knowledge & systems
 010 Bibliographies
 020 Library & information sciences
 030 Encyclopedias & books of facts
 040 No longer used—formerly Collected essays by language
 050 Magazines, journals & serials
 060 Associations, organizations & museums
 070 News media, journalism & publishing
 080 General collections
 090 Manuscripts & rare books

100 – Philosophy and psychology
 100 Philosophy
 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 (19th-century, 20th-century)

200 – Religion
 200 Religion
 210 Natural theology
 220 Bible
 230 Christian theology
 240 Christian moral & devotional theology
 250 Christian orders & local church
 260 Christian social theology
 270 Christian church history
 280 Christian denominations & sects
 290 Other & comparative religions




300 – Social sciences
 300 Social sciences, sociology & anthropology
 310 General statistics
 320 Political science
 330 Economics
 340 Law
 350 Public administration
 360 Social services; association
 370 Education
 380 Commerce, communications, transport
 390 Customs, etiquette, folklore

400 – Language
 400 Language
 410 Linguistics
 420 English & Old English
 430 Germanic languages; German
 440 Romance languages; French
 450 Italian, Romanian, Rhaeto-Romanic
 460 Spanish & Portuguese languages
 470 Italic languages; Latin
 480 Hellenic languages; Classical Greek
 490 Other languages

500 – Science
 500 Sciences
 510 Mathematics
 520 Astronomy & allied sciences
 530 Physics
 540 Chemistry & allied sciences
 550 Earth sciences
 560 Paleontology; Paleozoology
 570 Life sciences
 580 Plants
 590 Zoological sciences/Animals

600 – Technology
 600 Technology (Applied sciences)
 610 Medical sciences; Medicine
 620 Engineering & Applied operations
 630 Agriculture
 640 Home economics & family living
 650 Management & auxiliary services
 660 Chemical engineering
 670 Manufacturing
 680 Manufacture for specific uses
 690 Buildings

700 – Arts
 700 Arts
 710 Civic & landscape art
 720 Architecture
 730 Plastic arts; Sculpture
 740 Drawing & decorative arts
 750 Painting & paintings
 760 Graphic arts; Printmaking & prints
 770 Photography & photographs
 780 Music
 790 Recreational & performing arts

800 – Literature
 800 Literature rhetoric & criticism
 810 American literature in English
 820 English & Old English literatures
 830 Literatures of Germanic languages
 840 Literatures of Romance languages
 850 Italian, Romanian, Rhaeto-Romanic
 860 Spanish & Portuguese literatures
 870 Italic literatures; Latin
 880 Hellenic literatures; Classical Greek
 890 Literatures of other languages

900 – History, geography, (& biography)
 900 History
 910 Geography & travel
 920 Biography, genealogy, insignia
 930 History of ancient world
 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