000			00294nam a22001337a 4500
999			_c1241 _d1241
020			_a9788131725436
082			_a621.382
100			_aLeon W Couch
245			_aDigital and analog communication systems
250			_a7th
260			_aNew Delhi _bPearson _c2010
300			_a749
942			_cBK