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- United States. Congress. Senate. Committee on the Judiciary. Subcommittee on Terrorism, Technology, and Homeland Security45
- United States. Congress. House. Committee on Ways and Means. Subcommittee on Social Security42
- United States. Congress. House. Committee on Homeland Security. Subcommittee on Transportation Security and Infrastructure Protection41
- United States. Congress. Senate. Select Committee on Intelligence41
- United States. Congress. Senate. Committee on the Judiciary. Subcommittee on Technology, Terrorism, and Government Information39
- United States. Congress. House. Committee on the Judiciary38
- United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Coast Guard and Maritime Transportation37
- ProQuest (Firm)36
- United States. Congress. House. Committee on Armed Services. Subcommittee on Terrorism, Unconventional Threats, and Capabilities36
- United States. Congress. House. Committee on Foreign Affairs36
- United States. Congress. House. Committee on Homeland Security. Subcommittee on Cybersecurity, Infrastructure Protection, and Security Technologies, author36
- Safari Books Online (Firm)35
- United States. Congress. House. Committee on Homeland Security. Subcommittee on Economic Security, Infrastructure Protection, and Cybersecurity34
- Project Muse32
- United States. Congress. House. Committee on Homeland Security. Subcommittee on the Prevention of Nuclear and Biological Attack32
- United States. Department of Homeland Security. Office of Inspector General32
- United States. Government Accountability Office, author32
- United States. Congress. House. Committee on Homeland Security. Subcommittee on Cybersecurity, Infrastructure Protection, and Innovation, author31
- United States. Congress. House. Committee on Government Reform. Subcommittee on National Security, Veterans Affairs, and International Relations29
- United States. Congress. House. Committee on Government Reform. Subcommittee on Technology, Information Policy, Intergovernmental Relations, and the Census29