This latest electronic briefing book from the National Security Archive at George Washington University brings together some fascinating documents related to the 1963 accord outlawing nuclear testing in the atmosphere, under water, and in space. This treaty was called the Limited Test Ban Treaty (LTBT) and for decades many wondered if the nations that signed onto this document might have violated its terms. Here, visitors can look over 26 documents, including internal memos from the CIA, reports from the Joint Atomic Energy Intelligence Committee, and State Department documents related to China's first nuclear test. Section F is a real gem, as it contains a wealth of materials related to government responses and thoughts on the test ban during the 1970s.