"The Dependence of the Railroads on Increased Industrial Production and Increased Purchasing Power of Farm Products." Statement before the Interstate Commerce Commission on Increases on Freight Rates and Charges, January 18, Box: Series 10, Box 34. Henry Agard Wallace Papers, MsC0177. University of Iowa Special Collections. https://aspace.lib.uiowa.edu/repositories/2/archival_objects/403081 Accessed April 30, 2025.