by Bob Olenych
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40 Cross-Number Puzzles
Challenges Galore
40 Fun-tabulous Puzzles for Multiplicati...
Geometry and Measurement
Math Practice Puzzles Addition and Subtr...
Pre-Algebra
Kokuritsu Kokkai Toshokan shozō Meijiki ...
A Tangled Tale
Mathematical recreations and problems of...
The Game of Logic
O homem que calculava
Mathematics and the Imagination