Dewwy Decimal Classification System
000 GENERALITIES
100 PHILOSOPHY & PSYCHOLOGY
200 RELIGION
300 SOCIAL SCIENCE
400 LANGUAGE
500 NATURAL SCIENCES & MATHEMATICS
600 TECHNOLOGY (APPLIED SCIENCES
700 THE ARTS
800 LITERATURE & RHETORIC
900 GEOGRAPHY & HISTORY
100 PHILOSOPHY & PSYCHOLOGY
200 RELIGION
300 SOCIAL SCIENCE
400 LANGUAGE
500 NATURAL SCIENCES & MATHEMATICS
600 TECHNOLOGY (APPLIED SCIENCES
700 THE ARTS
800 LITERATURE & RHETORIC
900 GEOGRAPHY & HISTORY