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World War I- Vietnam, 2nd Edition
出版Center for Cryptologic History, National Security Agency, 2013
URLhttp://books.google.com.hk/books?id=26nXtwEACAAJ&hl=&source=gbs_api
註釋"A key purpose of this brochure is to improve the public's and intelligence professionals' understanding of traffic analysis as an intelligence discipline. Further, it is intended that this will be a living document, to be amplified and expanded as necessary research is completed. In its present form, the report also can be used for historical reference and could even serve as a basis for developing museum displays." -- page 3