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Can anyone in the Centos community have some references of these books/DVDs for purchase?
The best training material I've used is available at GuruLabs (www.gurulabs.com).
This is courseware with labs tested on Fedora, Redhat and SUSE, the last I checked they were still a little behind in which versions they support.
They have 'books' from beginning thru advanced administration, all continually improved.
Brett