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APA Citation
Smith, M. (2010). The emperor's codes : Bletchley Park's role in breaking Japan's secret ciphers. Place of publication not identified : Biteback Publishing. http://access.bl.uk/ark:/81055/vdc_100146625233.0x000001
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Smith, M. (2010). The emperor's codes : Bletchley Park's role in breaking Japan's secret ciphers. Place of publication not identified : Biteback Publishing. http://access.bl.uk/ark:/81055/vdc_100146625233.0x000001