00527nam a22001577a 4500 BD-DhUL 20170410115017.0 170410b xxu||||| |||| 00| 0 eng d BD-DhUL BD-DhUL 029.5 UNU Unesco thesaurus : A structured list of descriptors for indexing and retrieving literature in the feields of education , science, social science.cuulture and communication / Unesco : UN , 1977. V. ; 31cm. thesaurus ddc REF 175042 175042 0 0 ddc 0 029_500000000000000_UNU 1 REF 311232 DUL DUL UNC 2017-04-10 Gift 029.5 UNU D16950 2017-04-10 2017-04-10 REF