Good CNC Book?

Hi Group,
I have to travel for a couple of weeks for work and dug out an old
text book that I've never read to take with me. It's
called "Computer Numerical Control, Concepts and Programming" Third
Edition by Warren Seames. It's copyrighted 1995. I'd been taking
evening machining classes at a community college when I lived in CA.
When I got through the required manual machining classes and was
ready to take CNC I changed jobs (late 1995)and moved to Portland,
OR. Had already purchased the book for class but had to cancel my
enrollment.
My question is this: Do you think this book is too old to do me any
good? Technology changes so quickly that I don't want to get
confused by reading outdated material. I briefly glanced at it and
appendix 3 is titled "Codes in Common Use with Tape Machinery".
Wow. Sounds like "Troubleshooting your car's 6 volt generator".
Another appendix is titled "EIA Codes". Would these be pretty much
equivalent to the NIST codes that EMC and Mach1 are based on? I
don't know how much G-codes and programming practices might have
changed since the mid nineties. I know the hardware (computing) has
advanced light years.
Any opinions are welcome. If anyone has suggestions on good CNC
books to read I'm listening. Might as well use the time away from
converting my mill drill to learn how to run it when it's finished.
Thanks,
Ralph Wenzl