Philosophy of Existence
Karl Jaspers
Mathematics and Music: Composition, Perception, and Performance
James S. Walker & Gary W. Don
Treasury of Philosophy. Edited by D. D. Runes
Dagobert David Runes
Life in a Medieval City
Frances Gies & Joseph Gies
Evolve Your Brain: The Science of Changing Your Mind
Joe Dispenza
Hallucinogenic Plants: A Golden Guide
Richard Evans Schultes