The National Security Agency Declassified: History,Organization and Operations: A National Security Archive Electronic Briefing Book,Jeffrey T. Richelson,assisted by Michael L. Evans; National Security Archive,Washington, DC,Visited April, 2000. http://www.gwu.edu/～nsarchive/NSAEBB/NSAEBB23.html. 期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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The National Security Agency Declassified: History,Organization and Operations: A National Security Archive Electronic Briefing Book,Jeffrey T. Richelson,assisted by Michael L. Evans; National Security Archive,Washington, DC,Visited April, 2000. http://www.gwu.edu/～nsarchive/NSAEBB/NSAEBB23.html.

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