Operation of British Exchange Controls, Box 18, Folder 1, William McChesney Martin, Jr., Papers. Missouri History Museum. https://fraser.stlouisfed.org/content/?item_id=457002&filepath=/files/docs/historical/martin/18_01_19490927.pdf, accessed on May 22, 2018.
Classification of countries, % change against the dollar
- Board of Governors of the Federal Reserve System, Federal Reserve Board
- Meltzer's History of the Federal Reserve - Primary Sources