Bopp, Karl R., 1906-1979 and Federal Reserve Bank of Philadelphia "Economic Trends." 1956 Executive Program in Business Administration, Graduate School of Business, Columbia University, Arden House, Harriman, NY. (Outline), September 20 & 21, 1956, https://fraser.stlouisfed.org/title/1013/item/1202, accessed on November 17, 2024.