000 00279nam a2200121Ia 4500
100 _aDavid palmer
020 _a81 250 0988 4
942 _cBK
245 _aSwitched-on science level 1
260 _aOrient longman, Hyderabad
_c1994
082 _a809.9336 Pal
300 _axii,119p
999 _c31120
_d31120