00455nam 2275438 450000100060000000300230000600500090002900800410003808200150007907200260009402000180012010000180013826000270015625000060018324500410018965000260023065000190025675438StarLibrary Marc Built20180420201711 ||||| |||||||||||amh  a621.380422 acommunication systems a0-13-142492-0 aLeon W. Couch bPEARSON EDUCATI c2007 a2 adigital analog communication systems acommunication systems adigital analog