#025.431

0xx: information and general knowledge 02x: library science 025: library administration/departments 025.4: subject analysis and control 025.43: general classification systems 025.431: dewey decimal system

025.431

The Dewey Decimal Classification system sorts five; itself (025.431), Universal Decimal Classification (025.432) used abroad, Library of Congress Classification (025.433) used by the US government, the Bliss Bibliographic Classification (025.434) used in Britain, and Colon Classification (025.435) used in India. But there are countless other faceted classification systems across the world.

025.431

025.431

see also this post

dewey decimal classification (be careful when looking this up, you might get stuck in a recursive feedback loop)