United States. Board of Investigation and Research.

• ... Federal regulatory restrictions upon motor and water carriers
• Carrier taxation
• Comparison of rail, motor and water carrier costs
• Interstate trade barriers affecting motor-vehicle transportation
• Public aids to domestic transportation
• Report on interterritorial freight rates
• Report on rate-making and rate-publishing procedures of railroad, motor and water carriers
• Summary report on study of interterritorial freight rates
• The economics of coal traffic flow
• The economics of iron and steel transportation
• The national traffic pattern
• The report on practices and procedures of governmental control