Giving Away A Book A Day

Tomorrow, we'll announce a new book giveaway. First, let's tie up our loose ends.
We have a winner from yesterday: Joe successfully guessed Joe Biden's bid for the 1988 Democratic nomination, which was derailed by accusations of plagiarism before the first caucus or primary. Congratulations! I'll be in touch about getting you your prize.
As for Sunday's contest, 975 guesses and still no winner. So let me give two hints.
Hint #1: The number is between 1 and 1,503.
Hint #2: The number has something to do with the new issue of mental_floss magazine.
Keep those guesses coming on the original post.
Merry Christmas!