000 00228nam a2200097Ia 4500
008 170824s9999 xx 000 0 und d
020 _a9780007336449
100 _aPLATT, RICHARD
245 _aCODE MAKING CODE BREAKING
260 _bCOLLINS
942 _cTXTBK
999 _c1179
_d1179