Henry Ernest Dudeney/Puzzles and Curious Problems/99 - The Conspirators' Code/Historical Note
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Historical Note on Puzzles and Curious Problems by Henry Ernest Dudeney: $99$ - The Conspirators' Code
Dudeney attributes this to a correspondent identified as G. P., whose identity has not been ascertained.
Sources
- 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Digital Puzzles: $99$. -- The Conspirators' Code
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Cryptarithm Puzzles: $158$. The Conspirators' Code