000 00271nam a2200121Ia 4500
008 161121s9999 xx 000 0 und d
100 _aESSER (Karl)
245 0 _aTextbook of practical guide : Cryptogram
260 _cNIL
365 _b0
650 _aNIL
942 _cBK
999 _c90389
_d90389