TY  - BOOK
AU  - Aitchison,Jean
TI  - Unesco thesaurus :  : a structured list of descriptors for indexing and retrieving literature in the fields of education, science, social science, culture, and communication / 
U1  - 029.5 UNE.2 
PY  - 1977///
CY  - Paris : 
PB  - Unesco, 
KW  - Subject headings
KW  - Indexing
ER  -