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100   $a20020821d1973----km-y0itay50------ba
101 0 $aeng
105   $aa-------001yy
200 1 $aTelecommunication systems design$fM. T. Hills, B. G. Evans
210   $aLondon$cAllen & Unwin$dc1973
215   $av.$cill.$d24 cm
300   $a1. v.: Transmission systems
610 0 $aSistemi di telecomunicazioni
676   $a621.380'8
700  1$aHills,$bMichael Turner
702  1$aEvans,$bBarry George
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