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 - Vol.  1
U1  - 025.49 
PY  - 1977///
CY  - Paris
PB  - Unesco
N1  - Vol. 1 : Introduction, classified thesaurus,  permuted index, hierarchical display
ER  -