Best Post Apocalyptic Book (or Series) [Semifinal Round 2]

What is the best post apocalyptic book (or series)? 

I'm spending the week knocking out our backlog of "business posts" because they take an hour instead of five or six, and let me have a little break from the usual fare around here. Starting Monday next week, we will have a whole new schedule and a lot more posting (stay tuned).

The semifinal rounds go FAST. I'll have the results of this poll posted by a week from today and the final round goes up on Thursday. So don't dilly dally. Vote today!

Half of these titles are not going forth to the final round, but WHICH half is entirely up to you.

And while I know the laws of large numbers have begun to determine that a certain number of people won't read anything but the preview text and the poll before commenting that "OH THE HUMANITY!" please consider that 1) this is only half the titles  ("Oh my god how could Lord of the Rings not make it????" It did. It was on round one.), 2) there were rules that disqualified titles (particularly series titles that didn't conclude until after '75), and  3) we arrived here through a nomination process, and I controlled literally NONE OF IT but rather my readers made all the decisions, so if a title never got nominated, acting like it is a crime to the genre might make you look a little foolish, and maybe you should chime in a little sooner next time.

Don't forget you get three (3) votes, but that there is no ranking, so using as few votes as possible is better.

The poll itself is in the lower left at the bottom of the side menus.

I'm told if you're on mobile you have to click "webpage view" then scroll alllllllllll the way to the bottom, you can find the poll.