000 00279nam a2200121Ia 4500
100 _aDavid palmer
020 _a81 250 0989 2
942 _cBK
245 _aSwitched-on science level 2
260 _aOrient longman, Hyderabad
_c1994
082 _a899.9336 Pal
300 _axii,118p
999 _c30778
_d30778