ARCs

I am taking a minute (and a post) to talk about an ARC, or an advanced reader copy. I don't believe all books have these. They are printed before the finished copy is 100% done, and the publishers will give some away for review, and will also give the authors some, who will usually host a giveaway for them.
ARCs will most likely have a sign on them saying what they are.

For Not A Drop To Drink, the side image has the release date on the top of the spine.

For Antigoddess, there is a circle on the front of the cover.