The Dewey Decimal System coordinates materials on the same subject and on related subjects to make items easier to find on the library shelves.  This system organizes information into 10 broad categories.  Each major category is divided into 9 sub-categories.  Each sub-category is further divided into 9 specialized topics that can be broken down even further by adding decimals.  Each division becomes more specific.

000   Generalities

010        Bibliography

020        Library & Informational Services

030        General Encyclopedic Works

040        (Not used)

050        General serials & other indexes

060        General Organizations & Museums

070        News Media, Journalism, Publishing

080        General Collections

090        Manuscripts & Rare Books

100    Philosophy & Psychology

110         Metaphysics

120         Epistemology, Causation, Humankind

130         Paranormal Phenomena

140         Specific Philosophical

150         Psychological/Self Help

160         Logic

170         Ethics (Moral philosophy)

180         Ancient, Medieval, Oriental Philosophy

190         Modern Western Philosophy

200    Religion

210         Philosophy & Theory of Religion

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

290         Other Religions

300    Social Sciences

310         General Statistics

320         Political Science

330         Economics

340         Law

350         Public Administration

360         Social Problems & Services

370         Education

380         Commerce, Communications, Transport

390         Customs

400    Language

410         Linguistics

420         English & Old English

430         Germanic Languages (German)

440         Romance Languages (French)

450         Italian, Romanian

460         Spanish & Portuguese Language

470         Italic Languages (Latin)

480         Hellenic Languages (Classical Greek)

490         Other Languages

500    Natural Sciences & Mathematics

510         Mathematics    

520         Astronomy & Allied Sciences

530         Physics

540         Chemistry & Allied Sciences

550         Earth Sciences

560         Paleontology (Paleozoology)

570         Life Sciences (Biology)

580         Plants

590         Animals

600   Technology (Applied Sciences)

610         Medicine & Health

620         Engineering & allied Operations

630         Agriculture

640         Home & Family Management

650         Management & Business

660         Chemical Engineering

670         Manufacturing

680         Manufacture of Products for Specific Uses

690         Building & Construction/Remodeling

700    The Arts

710         Civic & Language 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, Sports

800   Literature & Rhetoric

810        American Literature in English

820        English & Old English Literatures

830        Germanic Literatures

840         Romance Literatures

850        Italian & Romanian Literatures

860        Spanish & Portuguese Literatures

870        Italic Literature (Latin)

880        Hellenic Literatures (Classical Greek)

890         Literatures of Other Languages

900   Geography & History

910        Geography & Travel

920        Collective Biography

930        History of Ancient World

940        History of Europe

950        History of Asia (Far East)

960        History of Africa

970        History of North America

980        History of South America

990        History of Other Areas