000 Generalities
000 is the most general class, and is used for works not limited to any one specific discipline, e.g., encyclopaedias, newspapers, general periodicals. This class is also used for certain specialised disciplines that deal with knowledge and information, e.g., computer science, library and information science, journalism. Each of the other main classes (100–900) comprises a major discipline or group of related disciplines.
- 010 Bibliographies
- 020 Library & information sciences
- 030 Encyclopaedias & books of facts
- 040 [Unassigned]
- 050 Magazines, journals & serials
- 060 Associations, organizations & museums
- 070 News media, journalism & publishing
- 080 Quotations
- 090 Manuscripts & rare books
