Freund, James L. and Epps, Richard W. "Railroads, Regulations, and Public Policy," in Federal Reserve Bank of Philadelphia. "July 1971," Business Review (Federal Reserve Bank of Philadelphia) (July 1971) : 3-10. https://fraser.stlouisfed.org/title/5580/item/557514/toc/523339 , accessed on May 4, 2024.