Math You Can't Use : Patents, Copyright, and Software
Ben Klemens
Proclus' On the Hieratic Art According to the Greeks
Eleni Pachoumi;
The Search for the Perfect Language
Umberto Eco
Spinors and Space-Time: Volume 2, Spinor and Twistor Methods ...
Roger Penrose & Wolfgang Rindler
Cambridge Monographs on Mathematical Physics (1)
Roots of the Human Condition
Frithjof Schuon