Jeff Heldt
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Kakuro Puzzle: The Best Japanese Puzzles Collection: 3 (Kakuro Puzzle Books)
Heldt, Jeff
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Math Brain Teasers For Adults With Answers: Water Fun Puzzles - The Best Puzzles Collection: 5 (Brain Teaser Books)
Heldt, Jeff
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Mathematical Puzzles For Children: Hundred Puzzles - The Best Japanese Puzzles Collection: 1 (Math Puzzle Books For Kids)
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Geometry Puzzles: Shakashaka Puzzles - The Best Japanese Puzzles Collection: 5 (Logic Puzzle Books)
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Complex Math Puzzles: CalcuDoku Puzzles - The Best Japanese Puzzles Collection: 2
Heldt, Jeff
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Brain Teasers And Riddles For Adults: Arukone Puzzles - 100 Large Print Puzzles: 3 (Brain Puzzles With Answers)
Heldt, Jeff
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Mathematics Puzzle Games With Answers: Sukrokuro Puzzles - 100 Large Print Puzzles: 3 (Math Brain Teasers For Adults)
Heldt, Jeff
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Mental Maths Puzzles: Nanro Puzzles - The Best Puzzles Collection: 1 (Logic And Math Puzzle Books)
Heldt, Jeff
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