 Tomorrow's Math: Unsolved Problems for the Amateur by Charles Stanley Ogilvy, 197202
 Tomorrow's Math: Unsolved Problems for the Amateur
 Math Odyssey 2000: Puzzles, Mysteries, Unsolved Problems, Breakthroughs, and the People of Mathematics by Clement W. Falbo, 199401
 Tomorrows Math 2ND Edition Unsolved Problems Fro by C Stanley Ogilvy, 1972
 Unsolved Problems of Noise and Fluctuations: UPoN'99: Second International Conference, Adelaide, Australia 1115 July 1999 (AIP Conference Proceedings)
 Math Odyssey Two Thousand ,Puzzles, Mysteries, Unsolved Problems, Breakthroughs, &the People of Mathematics 1994 publication by ClementW.Falbo, 19940101
 Old and New Unsolved Problems in Plane Geometry and Number Theory (Dolciani Math by Victor Klee; Stan Wagon, 19960101
