Unsolved Problems in Number Theory (Unsolved Problems in Intuitive Mathematics)

Unsolved Problems in Number Theory (Problem Books in Mathematics), Guy, Richard,

Problem Books in Mathematics: Unsolved Problems in Number Theory by Richard...

Solved and Unsolved Problems in Number Theory, Daniel Shanks

Unsolved Problems in Number Theory by Richard Guy: Used

Unsolved Problems in Mathematical Systems and Control Theory by Blondel, Megr...

Theory and Problems of Social Psychology David Krech Richard Crutchfield 1948 HC

Unsolved Problems in Number Theory by Richard K Guy: Used