144. Excellent introductions to the ongoing controversy on the use of the atomic bomb are J. Samuel Walker, "The Decision to Use the Bomb: A Historiographical Update," in Michael J. Hogan, ed., Hiroshima in History (New York, 1996), 11–37, and "Recent Literature on Truman's Atomic Bomb Decision: A Search for Middle Ground," Diplomatic History 29 (April 2007), 311–34.