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S. Loyd, Mathematical Puzzles of Sam Loyd. Dover, New York, 1959.

S. Loyd. Mathematical Puzzles of Sam Loyd. Dover, new York, 1959. 219

Sam Loyd. Mathematical Puzzles of Sam Loyd. Dover Publications, Inc., 1959.

S. Loyd. Mathematical Puzzles of Sam Loyd. Dover, 1959.

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