【図書】 Bentley’s complete phrase code
with the cyphers numbered from 00000 to 31462 (nearly 1000 million combinations) (with at least 2 letters difference between each half code-word) -- compiled by E.L. Bentley. -- E.L. Bentley -- 1923. -- 29 cm. -- xxi, 213, 67, [42], 8 p.
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