Lecture on Symbolism
Georges Ivanovich Gurdjieff
Understanding Linguistics: The Science of Language
John McWhorter
Studies in cognitive development; essays in honor of Jean Piaget
Jean Piaget
The Works of Philo: Complete and Unabridged
Philo of Alexandria
Strong's Hebrew Dictionary of the Bible
James Strong
Celestial Navigation by H. O. 249
John E. Milligan