LEADER 00000nam 2200193 a 4500 001 0085481 003 UkHlHU 007 t 008 001308 0 1944 000 eng 040 UkHlHU 050 4 Z 103 S6 100 0 Smith, Lawrence Dwight. 245 00 Cryptography, the science of secret writing. 260 London :|bAllen & Unwin,|c1944. 300 164p. 650 0 Cryptography. 946 650 |a Subfields only, containing single words only. No 600s present -- Check for possible Geac subject headings
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