An introduction to metaphysics
Henri Bergson
Book of Proof
Richard Hammack
The Conservation of Orbital Symmetry
R B Woodward, Roald Hoffmann
Complete Works of Xenophon (Illustrated) (Delphi Ancient Classics)
Xenophon
Hypercomplex Numbers: An Elementary Introduction to Algebras
I. L. Kantor & A. S. Solodovnikov