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Identify books in library

Library book code with Dewey decimal system
The number by which a book is identified
Dewey decimal system - books in a library are arranged by subject. These codes can be committed to memory.

Codes

#
Subject
000
Computer science, information and general work
100
Philosophy and psychology
200
Religion
300
Social Sciences
400
Language
500
Science
600
Technology
700
Art and recreation
800
Literature
900
History and geography