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*24500$aBasic concepts in data communications$cEditor: Geoffrey Carter ; contributors Margaret Aldis [... et al.]
*260  $aLondon$bHeinemann Computers in Education ; International Computers Limited$c1983
*300  $a181 s.
*4901 $aPrinciples of data communications
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*7001 $aAldis, Margaret$0(NO-TrBIB)2014656$_96008200
*7001 $aCarter, Geoffrey$0(NO-TrBIB)2014641$_23970900
*830 0$aPrinciples of data communications$_96008300
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