000
00305nam a2200145Ia 4500
008
230118s9999||||xx |||||||||||||| ||und||
082
_a
535
082
_b
GUP/O
100
_a
dr.s.l
_b
gupta
100
_b
dr.vkumar
245
0
_a
optics
260
_a
meerut
260
_b
pragati prakashan
260
_c
1989
999
_c
6191
_d
6191