000 00298nam a2200109 a 4500
005 20140414132113.0
008 110817s19uu xx 00 eng d
050 _aREF 503
_bH88 1990
245 _aOur world in danger :
_bYoung Scientist.
260 _aSingapore :
_bWorl book,
_c1990.
541 _eM6736
999 _c114829
_d114829