000
00309nam a2200145Ia 4500
008
220421s9999||||xx |||||||||||||| ||und||
020
_c
325
040
_a
ET
100
_a
SUBRAHMANIYAM N
245
0
_a
OPTICS
260
_b
S.CHAND PUBLICATION
_a
NEW DELHI
300
_a
668
500
_a
8142
942
_c
BK
999
_c
14473
_d
14473