000 00272nam a2200121Ia 4500
008 190216s9999||||xx |||||||||||||| ||und||
100 _aHarnam Singh
245 0 _aPrinciples Of Light
260 _bS Chand & Co
_c1987
300 _a470p
650 _aPhysics
942 _cBK
999 _c33132
_d33132