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Fifty 'Observer' brain-twisters : a book of mathematical and reasoning problems
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Fifty 'Observer' brain-twisters : a book of mathematical and reasoning problems

D. St. P. Barnard

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With solutions.

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Fifty 'Observer' brain-twisters : a book of mathematical and reasoning problems by D. St. P. Barnard. Published by Faber in 1962. Publication and catalogue information, links to buy online and reader comments.

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