Published by E.L. Bentley, Londres, 1921
Couverture rigide. Livre Bentley's Complete Phrase Code with the cyphers numbered from 00000 to 31462 (nearly 1000 million combination) compiled by E.L. BENTLEY. No. 58639. Published by E.L. Bentley, London, 1921. Un vol. in-12 cartonnage éditeur, approx. 300 pages. ETAT : ensemble bien conservé. Livre.