1. The GCHQ Puzzle Book II. (2018) Authors: GCHQ Record Type: Book Extent: 1 online resource (386 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. The Penguin book of puzzles. (2017) Editors: Moore, Gareth, 1975- Record Type: Book Extent: 1 online resource (288 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗