Intriguing volume from the popular American cryptologist, which presents a series of cryptographic puzzles framed as a elementary course in cryptography given by an uncle to his nephew, many of which reference real cases encountered by Yardley during WWI. With grids in which to solve the puzzle. The first few puzzles have been attempted using pencil. 191pp. Sunning to spine, rubbing to edges. Staining to rear cover. Tanning to page edges but contents otherwise sound, Good.
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