WISE: Classification systems: Library of Congress

All libraries arrange or classify material according to the subject or topic, rather than colour or size. In this Library, the Library of Congress Classification System is used to decide the main subjects. The letters of the alphabet represent these subjects.

Each title has its own unique classification number (known as the call number), which is a combination of letters and numbers e.g. DU400.B328 1998, that is used to arrange the item on the shelf.