Held, Gilbert Data communications networking devices : operation, utilization, and LAN and WAN internetworking / Gilbert Held - 4th ed. - Chichester: Wiley, Ac1999 - xxiv, 855 pages: ill; 25 cm Includes index. ISBN: 9780471975151 (hbk) Subjects--Topical Terms: Data transmission systems Dewey Class. No.: 004.6 / HEL