From Dead Media Archive
Revision as of 15:12, 5 October 2008 by Teg217
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History of the Enigma
Enigma Machine: How it Works
Enigma Machine: How it was Used
- Allsop, F. C. Practical Electric Bell Fitting, a Treatise on the Fitting-up and Maintenance of Electric Bells and All the Necessary Apparatus, with Nearly 150 Illustrations. (London : E & F. N. Spon, 1892).