Government Attic has also just posted a somewhat less declassified NSA compendium from 1993: A Collection of Writings on Traffic Analysis, http://www.governmentattic.org/8docs/NSA-TrafficAnalysisMonograph_1993.pdf"
Link to Original Source
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You see but you do not observe. Sir Arthur Conan Doyle, in "The Memoirs of Sherlock Holmes"