A Dictionary of Space Exploration
Stephen O'Meara & E. Julius Dasch
Oxford Quick Reference Online (1)
A Short History of the Papacy in the Middle Ages
Walter Ullmann
William the Conqueror: A Life From Beginning to End
Hourly History
The Summa Theologica: Complete Edition
Saint Thomas Aquinas
Multiple View Geometry in Computer Vision
Richard Hartley & Andrew Zisserman
The Fountainhead
Ayn Rand