000 00319nam a2200145Ia 4500
008 220421s9999||||xx |||||||||||||| ||und||
020 _c450
040 _aET
100 _aSingh Harnam
245 0 _aPractical Physics
260 _bSultan Chand & Sons
_aNEW DELHI
300 _a1045
500 _a55961
942 _cBK
999 _c61974
_d61974