Blyth, W. John Telecommunications Concepts Development and Management - 2nd - New York : Glencoe/McGraw-Hill, c1990 - 362 p. : ill Includes Index ISBN: 0026808412 ISSN: Subjects--Topical Terms: Data Transmission SystemsIntercommunication SystemsTelecommunications Dewey Class. No.: 621.382 / BLY