Source: Barnes & Noble

Sales of political books have grown immensely in 2018.

But not all books about President Donald Trump are equally valued across the United States, and readers' preferences appear to offer yet another example of how regionally polarized Americans have become on politics.

Data released Tuesday by bookseller Barnes & Noble show a 57 percent boost in political book sales from a year earlier.

The top three sellers so far in 2018 are widely viewed as taking a more negative look at Trump and his White House. They include former FBI Director James Comey's memoir, "A Higher Loyalty," and the hotly debated tell-all "Fire and Fury" by Michael Wolff.

The number-one bestseller, "Fear: Trump in the White House" by Washington Post reporter Bob Woodward, sold more than one copy per second on its release day, Barnes & Noble said. It was the fastest-selling book, overall, for Barnes and Noble in over three years.