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020 _a92-3-102938-X
040 _aBD-DhPL
_bEnglish
_cBD-DhPL
_dBD-DhPL
082 _a500 / U2w
110 _aUnited Nations Educational, Scientific and Cultural Organization.
_9187345
245 _aWorld science report 1993 /
_cUNESCO.
260 _aParis :
_bUNESCO,
_cc 1993.
300 _a278 p. :
_bill. ;
_c30 cm.
508 _a86
650 _aReports
_vWorld science.
_9187346
942 _2ddc
_cBK