Essential XML Quick Reference: A Programmer's Reference to XML, ...
Aaron Skonnard
MySQL Tutorial
Laura Thomson & Luke Welling
How to Think Like Benjamin Graham and Invest Like Warren Buffett
Lawrence A. Cunningham
SUPERSYMMETRY IN QUANTUM AND CLASSICAL MECHANICS
Bijan Kumar Bagchi
Incompleteness and Computability: An Open Introduction to Gödel's ...
Richard Zach & Open Logic Project