GSchnitzer and Warped9 and some other threads have got me thinking about something specific I've wanted to ask for a long time:
What was the "official" backstory at the time of Star Trek. This would include any animated backstory but not from TMP onward. I'm curious about it. I know there were many changes. I'm not too interested in the "cannon" version because that was changed and changed again. Anything from First Contact and Enterprise would definitely be out of the scope of what I'm looking for, although anyone can post anything they like, of course, but I want to stick to what Star Trek fans in say, 1977 would have known about the Federation and it's universe.
A good source would be the first run of Trek novels from Bantam in the '70s, particularly the New Voyagers short story collections. The Pocket line didn't start until after TMP came out, but I'm guessing many of the early authors were more influenced by a decade of reruns than a movie they might've watched once in the theater, so it might be worth checking out The Klingon Gambit and The Entropy Effect.