Serious Python
Julien Danjou
Hacking the Cable Modem
DerEngel
Impractical Python Projects
Lee Vaughan
Red Hat Enterprise Linux 6 Administration
Sander van Vugt
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain