00520nam a2200181 i 4500008004100000020001500041040000800056082001300064100001700077245004700094260005000141300002900191336002600220337002800246338002700274500002000301700001700321250829m19821978xx ab         001 0 und d  a0435346946  aGCL  a380bFOR10aForbes, Jean10aCommunications and Network /cJean  Forbes  bHeinemann Educational Books :aLondon,c1978.  a80 Pages :bpbk.c24 cm.  atextbtxt2rdacontent  aunmediatedbn2rdamedia  avolumebnc2rdacarrier  aIncludes Index.10aRoss, James