000 00265nam a22000977a 4500
008 230919b |||||||| |||| 00| 0 eng d
040 _aNational Science Library
_cNational Science Library
245 _aUNESCO sources
260 _aParis:
_bUNESCO,
942 _2udc
_cCR
999 _c61211
_d61211