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003 IN-NITTTR
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040 _beng
040 _cIN-NITTTR
041 _aeng
082 _a621.32 W168T
100 _aWalsh, J.W.T.
245 0 _aTextbook of illuminating engineering :
_b(intermediate grade) /
_cWalsh, J.W.T.
942 _2ddc
_cBK
999 _c6421
_d6421