GCHQ Puzzle Book

• https://openlibrary.org/books/OL28619107M/GCHQ_Puzzle_Book
• 368
• 2016
• Anonymous https://openlibrary.org/authors/OL904271A/Anonymous
• GCHQ Staff https://openlibrary.org/authors/OL8095099A/GCHQ_Staff
• Penguin Books, Limited
• Michael Joseph
• Penguin UK
• Puzzles https://openlibrary.org/subjects/puzzles
• [9780718185541]
• https://covers.openlibrary.org/b/id/13943981-S.jpg
• https://covers.openlibrary.org/b/id/13943981-M.jpg
• https://covers.openlibrary.org/b/id/13943981-L.jpg