000 00233 a2200097 4500
001 50976
100 _aAndrew Cristopher
245 _aCode breaking & Signals Intelligence
260 _aLondon
_bFrank Cass
_c
090 _c32276
_d32276
942 _aNUST-CAE
_cM
_c24754
999 _c286049
_d286049