The Albuquerque Journal ran an article on December 18th about books published in 2009 related to New Mexico that they recommend. One sentence said, "The best-selling adult book in this little shop is the paperback The Pot Thief Who Studied Pythagoras (Oak Tree Press, $15) by J. Michael Orenduff. It's a low-key mystery set in Albuquerque's Old Town." Maybe having it described as an "adult book" will help me reach a new audience? The explanation is that the previous paragraph was talking about books for children, and the writer evidently thought the opposite of children’s books is adult books. The article was picked up by the website AllBusiness, which generated a Google alert for me, so that's how I found about the newspaper piece.