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Heritage Foundation: Why Have We Not Been Attacked Again? Competing and Complementary Hypotheses for Homeland Attack FrequencyBy:
Dallas Boyd and Lewis A. Dunn with Aaron Arnold and Michael Ullrich, Science Applications International Corporation (SAIC) and,
James Scouras and Jonathan Fox Advanced Systems and Concepts Office Defense Threat Reduction Agency (DTRA)
Retrieved From: Heritage Foundation: http://www.heritage.org/
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