Networking.rar and Unixbookshelf.rar include
these O'Reilly books :

Building Internet Firewalls
Practical UNIX & Internet Security 
UNIX Power Tools
UNIX in a Nutshell: System V Edition
Learning the vi Editor
Sed & Awk
Learning the Korn Shell
Learning the UNIX Operating System
DNS & BIND
TCP/IP Network Administration
Sendmail
Sendmail Desktop Reference

As pretty html files.

Enjoy