Bopp, Karl R. (Karl Richard), 1906-1979 and Federal Reserve Bank of Philadelphia "Field Meeting held at Americus Hotel, Allentown, Pa.." Notes, April 8, 1959, https://fraser.stlouisfed.org/title/1013/item/1158, accessed on April 23, 2024.
Bopp, Karl R. (Karl Richard), 1906-1979 and Federal Reserve Bank of Philadelphia "Field Meeting held at Americus Hotel, Allentown, Pa.." Notes, April 8, 1959, https://fraser.stlouisfed.org/title/1013/item/1158, accessed on April 23, 2024.