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- Walter L. Pforzheimer Intelligence Collection (Beinecke Rare Book and Manuscript Library)756
- Library of Congress. Congressional Research Service324
- United States323
- United States. Congress. Senate. Select Committee on Intelligence165
- United States. Congress. House. Permanent Select Committee on Intelligence90
- ebrary, Inc78
- United States. Congress. Senate. Committee on the Judiciary71
- United States. Congress. House. Committee on Homeland Security. Subcommittee on Intelligence, Information Sharing, and Terrorism Risk Assessment65
- United States. Congress. Senate. Committee on Armed Services65
- Project Muse60
- Center for the Study of Intelligence (U.S.)48
- Library of Congress. Congressional Research Service, issuing body43
- Andrew, Christopher M.36
- United States. Congress. House. Committee on the Judiciary. Subcommittee on Crime, Terrorism, and Homeland Security35
- Johnson, Loch K., 1942-32
- United States. Central Intelligence Agency32
- United States. Congress. Senate. Committee on Governmental Affairs29
- National Commission on Terrorist Attacks upon the United States28
- United States. Congress. House. Committee on the Judiciary26
- United States. Congress. Senate. Select Committee on Intelligence, author26