Sproul, Allan, 1896-1978. Letter, Allan Sproul to Winthrop Aldrich, [Correspondence A-M, 1936-1955], . https://fraser.stlouisfed.org/archival/1174/item/3408, accessed on April 18, 2024.
Sproul, Allan, 1896-1978. Letter, Allan Sproul to Winthrop Aldrich, [Correspondence A-M, 1936-1955], . https://fraser.stlouisfed.org/archival/1174/item/3408, accessed on April 18, 2024.