The UNESCO (United Nations Educational, Scientific and Cultural Organization ) Library has available a trilingual (preferred terms in English/French/Spanish) Thesaurus of some 7,000 terms that "closely reflects the evolving content of UNESCO documents and publications." Users may browse the online Thesaurus alphabetically or hierarchically. The Thesaurus includes French and Spanish equivalents of English preferred terms as well as separate indexes of French and Spanish terms (with equivalents). Instructions on using the Thesaurus and information on its development are available on-site.