000 00334nam a2200145Ia 4500
020 _a0000000000
040 _cPK-LaCSN
082 _b2028_TR
_a500
245 0 _aScience level 2
260 _c2012;
_aKarachi,
_bThe City School.
300 _a0
942 _2ddc
_cTB
999 _c734006
_d734006