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101 0 $aeng
102   $aGB
105   $a        001yy
200 1 $a<<The >>code book$ethe secret history of codes and codebreaking$fSimon Singh
210   $aLondon$cFouth Estate$d1999
215   $aXIII, 402 p.$d20 cm
610 0 $aCriptografia
610 0 $aCodici cifrati
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700  1$aSingh,$bSimon$079243
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