TY  - BOOK
AU  - Aitchison,Jean
AU  - إيتشيسون، جون
TI  - Unesco thesaurus: a structured list of descriptors for indexing and retrieving literature in the fields of education, science, social science, culture, and communication
SN  - 92-3-101469-2
U1  - 025.49 21E
PY  - 1977///
CY  - Paris
PB  - UNESCO
ER  -