Over the past sixty years, a number of American presidents have attempted to craft a working comprehensive nuclear test ban. This digital collection from The National Security Archive at The George Washington University brings together a host of documents from the U.S. State Department and other agencies to illustrate how "nonproliferation goals shaped U.S. internal discussions of the Comprehensive Test Ban Treaty (CTBT) from the 1950s through the late 1970s." There are eleven key documents here, dating back to the 1957 draft background paper which identifies nuclear proliferation as the "fourth country" problem. The "fourth country" concept arose as the next country after the United States, Soviet Union, and the United Kingdom to obtain nuclear devices would be the so-called "fourth country". The collection was edited by William Burr and released in August 2010, and it is one that policy experts and diplomacy types will find very intriguing.