Unesco thesaurus : a structured list of descriptors for indexing and retrieving literature in the fields of education, science, social science, culture, and communication - Unesco; Aitchison, Jean. (Paris : Unesco, 1977)
v. 1. Introduction, classified thesaurus, permuted index, hierarchical display.--v. 2. Alphabetical thesaurus.
Keywords: Subject headings; Indexing