An introduction to metaphysics
Henri Bergson
The Road to Reality: A Complete Guide to the Laws of the Universe
Roger Penrose
Principia Mathematica Vol 2
Alfred North Whitehead & Bertrand Russel
A History of Mathematical Notations: Vol. Ii
Florian Cajori
Z-80 Microprocessor: Architecture, Interfacing, Programming ...
Ramesh Gaonkar