000			003620000a22001570004500
245			_aFrequency conversion
100			_aThomson, J.
100			_aTurk, W.E.
100			_aBeesley, M.J.
260			_aLondon _bWykeham _c1969
300			_a206 p., ill.
440			_aWykeham Technological series
080			_a621.3.018.4 _bT5
041			_aEN
942			_cBK
999			_c94392 _d94392