000 00324nam a2200109Ia 4500
008 130131s9999 xx 000 0 und d
100 _aNg, Lay Yin
245 _aUnderstanding biolody O level / Ng Lay Yin
260 _bSingapore : GLM, 2011
300 _axv, 381 p. ; 25 cm.
650 _aBiology --Examinations, questions, etc
999 _c32990
_d32580