The Phi Beta Kappa Book Awards are the Ralph Waldo Emerson Award, the Christian Gauss Award (named for Christian Gauss), and the Phi Beta Kappa Award in Science. The Book Awards are given annually to outstanding scholarly books published in the United States. Winning works, which are drawn from the fields of the humanities, the social sciences, the natural sciences and mathematics, must be of broad interest and accessible to the general reader. Each award carries a $10,000 prize. The winners were selected from five short listed titles in each category.