000 00308nam a2200121 a 4500
005 20140414132114.0
008 110817s19uu xx 00 eng d
050 _aREF 503
_bP69 1990
245 _aThe planet earth.
260 _aSingapore :
_bWorl book,
_c1990.
440 _aYoung Scientist
541 _eM6753
999 _c114846
_d114846