Couch, Leon W. creator text New York London Macmillan Collier Macmillan c1990 3rd ed. monographic xxix, 766 p. : ill. ; 24 cm. Leon W. Couch II. Includes index. Bibliography: p. 726-733. Telecommunication systems Digital communications TK5101 .C69 1990 621.38/0413 0023253916 : 89002509 UOEL 000 20150429102204.0 1979163