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200 1 $aPrinciples of data communication$fR. W. Lucky , J. Salz , E. J. Weldon.
210   $aNew York$cMcGraw-Hill book company$d1968
215   $aVIII, 433 p.$cill.$d24 cm
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700  1$aLucky,$bR. W.$02622
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702  1$aWeldon,$bEdward J.
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