Philosophical Explanations
Robert Nozick
Calculus Made Easy
Martin Gardner & Silvanus P. Thompson
Philosophy of Science: A New Introduction
Philip Kitcher & Gillian Barker
Philip K. Dick and Philosophy: Do Androids Have Kindred Spirits?
D. E. Wittkower
Why Victorian Literature Still Matters
Philip Davis
NLTK: The Natural Language Toolkit - Paper
Steven Bird