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The Dewey Decimal System assigns numbers to all non-fiction (i.e. information books) based on topic. This ensures that all books about the same topic are shelved together. All school and public libraries (worldwide) use dewey. The system has been in place for over 130 years (with frequent updates).
000s Computer science, information & general works
005 Computers100s Philosophy & Psychology
158 Chicken Soup200s Religion
220 Bible300s Social sciences
364 Crime400s Language
440 French500s Science
540 Chemistry600s Technology
690 Construction700s Arts & recreation
780 Music790 Sports
800s Literature
822 Shakespeare900s History & geography
971 Canadian History