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- United States34
- United States. Congress. Senate. Committee on Environment and Public Works, author19
- United States. Congress. House. Committee on Transportation and Infrastructure, author8
- United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Highways and Transit (2007- ), author4
- Meyer, John Robert3
- United States. Bureau of the Census3
- United States. Congress. Senate. Committee on Banking, Housing, and Urban Affairs, author3
- United States. Congress. Senate. Committee on Commerce, Science, and Transportation, author3
- United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Surface Transportation and Merchant Marine Infrastructure, Safety, and Security, author3
- Adams, Henry C. (Henry Carter), 1851-19212
- Mergent, Inc2
- Moody's Investors Service2
- United States. Census Office2
- United States. Census Office. 11th census, 18902
- United States. Congress. House. Committee on Transportation and Infrastructure. Panel on 21st-Century Freight Transportation, author2
- American Association of State Highway Officials1
- American Association of State Highway and Transportation Officials1
- Barger, Harold1
- Carlson, Daniel, 1946-1
- Christensen, Daphne1