Association of American Railroads. Economics and Finance Dept, United States. Interstate Commerce Commission, & Association of American Railroads. Economics and Finance Dept. Statistics of railroads of class I in the United States: Statistical summary. Association of American Railroads, Economics and Finance Dept.
Cita Chicago (17th ed.)Association of American Railroads. Economics and Finance Dept, United States. Interstate Commerce Commission, i Association of American Railroads. Economics and Finance Dept. Statistics of Railroads of Class I in the United States: Statistical Summary. Washington,: Association of American Railroads, Economics and Finance Dept.
Cita MLA (8th ed.)Association of American Railroads. Economics and Finance Dept, et al. Statistics of Railroads of Class I in the United States: Statistical Summary. Association of American Railroads, Economics and Finance Dept.