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200 1 $aCommunication systems$ean introduction to signals and noise in electrical communication$fA. Bruce Carlson
210   $aNew York$cMcGraw Hill$d1968
215   $aXIII, 470 p.$cill., tav.$d23 cm
225 2 $aMcGraw Hill electrical and electronic engineering series
410   $12001$aMcGraw Hill electrical and electronic engineering series
461  1$1001-------$12001
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700  1$aCARLSON,$bA. Bruce$0535228
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996   $aCommunication systems$9876516
997   $aUNISA