000			002680000a22001210004500
245			_aLight calculation and measurements
100			_aKeitz, H.A.E.
250			_a2d ed.
260			_aLondon _bMacmillan _c1977
080			_a628.9 _bK4
041			_aEN
942			_cBK
999			_c111270 _d111270