000 00309nam a2200121 a 4500
005 20140414132114.0
008 110817s19uu xx 00 eng d
050 _aREF 503
_bD54 1990
245 _aDiscovering gases.
260 _aSingapore :
_bWorl book,
_c1990.
440 _aYoung Scientist
999 _c114844
_d114844