000 00287cam a22001097a 4500
008 180718b1974 xxu||||| |||| 00| 0 eng d
082 _aP un3/29
245 _aThe unesco educational simulation model (ESM)
_cby UNESCO
260 _aParis
_bUNESCO
_c1974
300 _a29p.
700 _aUNESCO
999 _c494266
_d494266