“The National Security Archive at George Washington University maintains a trove of declassified government papers, including voluminous files involving national security decision making during the Cold War. Tom Blanton, the director, and his colleagues guided [research assistant] Gabriela and me through the archive’s collections, many of which are assembled and analyzed in thoughtful electronic briefing books. William Burr, a senior analyst, has edited several invaluable collections about nuclear weapons policy during the Cold War.”