A Beginner's Further Guide to Mathematical Logic
Raymond M. Smullyan
The Prime Number Conspiracy
Lin, Thomas, ed. foreword by James Gleick
Ecstasy: Understanding the Psychology of Joy
Robert A. Johnson
Handbook of Philosophical Logic - Volume 5
Dov M. Gabbay & Franz Guenthner
Notes on Philosophy, Probability and Mathematics
Frank Plumpton Ramsey
A World Full of Gods: An Inquiry Into Polytheism
John Michael Greer