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Challenging Mathematical Problems with Elementary Solutions, Vol. I
$20.24 $13.58Dover Publications Inc.
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Sale
Challenging Mathematical Problems with Elementary Solutions, Vol. II
$17.60 $12.31Dover Publications Inc.
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Sale
Challenging Mazes: 48 New & Unusual Puzzles: 48 New & Unusual Puzzles
$6.87 $6.28Dover Publications Inc.
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