1. 01. English Non Fiction World's hardest puzzles / by Townsend, Charles Barry. Publication: New York : Sterling Pub. Co., 1992 . p. cm. , Includes index. Date:1992 Availability: Copies available: (1), Actions:
2. 01. English Non Fiction Hidden logic puzzles / by Weaver, Charles. Publication: New York : Sterling Pub. Co., 1992 . 127 p. : 22 cm. Date:1992 Availability: Copies available: (2), Actions: