<page_title> List of winners of the National Book Award </page_title> <section_title> Arts and Letters </section_title> <table> <cell> Justin Kaplan </cell> <cell> Mr. Clemens and Mark Twain: A Biography (biog. Mark Twain) </cell> </table>
Kaplan's book, Mr. Clemens and Mark Twain, won the National Book Award in the category of Arts and Letters.