Sorry folks, I hadn't realised this was in the TOS forum when I made that post.
The Art Of Star Trek has got some good artwork from TOS in it, but I'd further like to recommend the original
Star Trek Sketchbook. Some terrific rare Matt Jefferies art design (among other things) from the TOS days. There are photos of an amazingly detailed miniature model Jeffries had built of the Enterprise interior sets as well, which I've actually used as a basis for building CGI renders of the locations.