000			003280000a22001450004500
245			_aCommunication systems analysis
100			_aJohns, P.B.
100			_aRowbotham, T.R.
260			_aLondon _bButterworths _c1972
300			_a207p.
020			_a0408701978
080			_a621.391 _bJ6
041			_aEN
942			_cBK
999			_c103189 _d103189