LEADER 00000nam 2200205 a 4500 001 0813398 003 UkHlHU 007 t 008 003103 7 1986 000 eng 040 UkHlHU 050 4 TK 5105.5 M3 100 0 Marsden, Brian W. 245 00 Communication network protocols. 250 2nd ed. 260 Bromley :|bChartwell-Bratt,|c1986. 300 344p. 650 0 Electric telegraphy. 946 020 absent -- ISBN check required
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