Douglas St. Paul Barnard

• Adventures in mathematics
• Anatomy of the crossword
• It's all done by numbers
• 50Daily telegraph brain-twisters
• A book of mathematical and reasoning problems
• Adventures in mathematics
• Fifty 'Observer' brain-twisters
• Figure it out: 100 puzzles
• It's all done by numbers
• One hundred braintwisters
• One hundred braintwisters
• Seaside quizzes, games and puzzles