Sproul, Allan, 1896-1978. Correspondence Regarding the Expansion of a Confidential Financial-surveillance Procedure That Was Piloted at the Federal Reserve Bank of New York to Aid in Export Control, Box 13, Folder 4, Item 18, John W. Snyder Papers, 1918-1980. https://fraser.stlouisfed.org/archival/1347/item/72963, accessed on March 23, 2025.