Columbia subject headings:
United States. Congress. House. Committee on Interstate and Foreign Commerce.
United States. Congress. Senate. Committee on Commerce.
United States. Congress. Senate. Committee on Commerce. Subcommittee on Surface Transportation.
Harvard subject headings:
United States. Congress. House. Committee on Interstate and Foreign Commerce.
United States. Congress. Senate. Committee on Commerce. Subcommittee on Surface Transportation.
Princeton subject headings:
United States. Congress. House. Committee on Interstate and Foreign Commerce
United States. Congress. Senate. Committee on Commerce. Subcommittee on Surface Transportation