1. 01. English Non Fiction Mathemagic / by Blum, Raymond. Publication: New York : Sterling Pub. Co., 1991 . 128 p. : , Includes index. 22 cm. Date:1991 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: