- The Music of the Primes: Why an Unsolved Problem in Mathematics Matters by Marcus du Sautoy,  2004-09-06
 - UNSOLVED AND UNSOLVABLE PROBLEMS IN GEOMETRY by HERBERT MESCHKOWSKI,  1966
 - Some unsolved social problems of a university town by Arthur Evans Wood,  2010-09-13
 - Only Problems, not Solutions! by Florentin Smarandache,  2007-12-01
 - Famous problems of mathematics;: Solved and unsolved mathematical problems, from antiquity to modern times by Heinrich Tietze,  1965
 - Puerto Rico, unsolved problem, by Earl S. Garver ... [and] Ernest B. Fincher. With maps and drawings by John Morgan and William Schuhle by Earl Simeon Garver,  1945-01-01
 - Unsolved Problems in Number Theory (Problem Books in Mathematics / Unsolved Problems in Intuitive Mathematics) by Richard Guy,  2010-11-02
 - Research on Smarandache Unsolved Problems (in Chinese language), Vol. 5 (Chinese Edition) by editors Jianghua Li & Yanchun Guo,  2009-09-16
 - Math Odyssey 2000: Puzzles, Mysteries, Unsolved Problems, Breakthroughs, and the People of Mathematics by Clement W. Falbo,  1994-01
 - Unsolved Problems in Computer Science: P Versus Np Problem, Aanderaa-karp-rosenberg Conjecture 
 - Unsolved Problems in Physics: Accretion Disc, Ball Lightning, Magnetic Monopole, List of Unsolved Problems in Physics, Pioneer Anomaly 
 - The Three Unsolved Problems of Ancient Greece: An entry from Gale's <i>Science and Its Times</i> by Todd Timmons,  2001
 - Famous Problems of Mathematics, Solved & Unsolved Problems From Antiquity to Modern Times, by Heinrich, Tietze,  1965
 - Mark Ellis, or, Unsolved Problems by Will C. Whisner,  1899
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