LOGICVILLE
Mathematical Puzzles
Dual Cryptograms
Solution to Puzzle 138. CRYPTOGRAM
"HE WHO RECEIVES A GOOD TURN SHOULD NEVER FORGET IT, HE WHO DOES ONE SHOULD NEVER REMEMBER IT."
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Recreational Mathematics
Mathematical Footprints: Discovering Mathematical Impressions All Around Us
The Joy of Mathematics
Fractals, Chaos, Power Laws : Minutes from an Infinite Paradise
Chaos and Fractals : New Frontiers of Science
Tangram Corner
Large Tangram
Tangram Puzzle Set