Skip to search
Skip to main content
- United States159
- United States. Congress. Senate. Committee on Environment and Public Works, author32
- United States. Congress. Senate. Committee on Commerce, Science, and Transportation, author27
- Food and Agriculture Organization of the United Nations25
- United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Aviation, author20
- World Health Organization15
- Geological Survey (U.S.)10
- United States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Clean Air and Nuclear Safety, author10
- United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Surface Transportation and Merchant Marine Infrastructure, Safety, and Security, author9
- United States. Congress. House. Committee on Energy and Commerce. Subcommittee on Oversight and Investigations, author8
- United States. Congress. House. Committee on Oversight and Government Reform. Subcommittee on Government Operations, author8
- United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Highways and Transit (2007- ), author8
- United States. Congress. Senate. Committee on Health, Education, Labor, and Pensions, author8
- United States. Congress. Senate. Committee on Homeland Security and Governmental Affairs, author8
- European Commission. Directorate-General for Environment, Nuclear Safety, and Civil Protection7
- Organisation for Economic Co-operation and Development7
- U.S. Atomic Energy Commission7
- United States. Congress. House. Committee on Transportation and Infrastructure, author7
- United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Coast Guard and Maritime Transportation, author7
- United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Aviation Operations, Safety, and Security, author7