000 00284nam a2200121Ia 4500
008 220201s1995 xx 000 0 eng d
082 _a530
_bGUP
100 _aGupta,S.L.
245 0 _aConcepts of modern physics
260 _aDelhi
_bDhanpat Rai
_c1995
300 _a628
942 _2ddc
999 _c34746
_d34746