The O'Reilly books that you mention include _Essential System
Administration_ by AEleen Frisch, and _X Window System Administration
Guide_ by Linda Mui and Eric Pearce.  (Just to point out that O'Reilly
does publish admin type books as well as user books.  (^&)

I suggest that you look at the FAQ's off of the main NetBSD page:

 http://www.netbsd.org/Documentation/

...and for book titles in particular, the first item under Other
information gives Recommended reading:

 http://www.netbsd.org/Documentation/books.html

(If you can read Japanese, you can apparently get several NetBSD-specific
books.  (^&)


  "I probably don't know what I'm talking about."  --rkr@rkr.kcnet.com