These documents are also available as rpms and pdf files in the RPMS and pdf
directories respectively.
Installation Guide
Introduction to System Administration
System Administration Guide
Reference Guide
Security Guide
Step by Step Guide
Note: The above documentation is provided (and copyrighted) by Red Hat®, Inc. The documentation is released via the Open Publication License (V1.0 or later). Red Hat®, Inc. has added the further requirement that "Distribution of substantively modified versions of this document is prohibited without the explicit permission of the copyright holder." Here is a copyright notice in it's entirety.
The CentOS project redistributes these original works (in their unmodified form) as a reference for CentOS-3, because CentOS-3 is built from publicly available open source SRPMS. We don't modify the above files in any way to be compliant with the upstream vendor's distribution policy.