Sproul, Allan, 1896-1978. Letter, Sproul to Professor Elmer Wood, . https://fraser.stlouisfed.org/archival/1174/item/3404, accessed on April 23, 2024.
Sproul, Allan, 1896-1978. Letter, Sproul to Professor Elmer Wood, . https://fraser.stlouisfed.org/archival/1174/item/3404, accessed on April 23, 2024.