Using and Administering Linux: Volume 1
David Both
Mastering Flask Web Development
Daniel Gaspar & Jack Stouffer
Python Playground
Geeky Projects for the Curious Programmer
Professional Linux Kernel Architecture
Wolfgang Mauerer
Unauthorised Access
Wil Allsopp
Cryptography Engineering
Niels Ferguson & Bruce Schneier & Tadayoshi Kohno
CCNA Certification Practice Tests
Jon Buhagiar