020
Library & information sciences
Libraries, archives, information retrieval, and knowledge management.
Computer science, information & general works / Library & information sciences
2 pages
- Library of Congress Online Catalog
loc.gov
Search the Library of Congress collections: books, serials, maps, music, and recorded sound. The national library of the United States.
- Dewey Decimal Classification — OCLC
oclc.org
The world's most widely used library classification system, organizing knowledge into ten main classes that span the world of knowledge.