Letter from R.C. Leffingwell to Charles A. Morss, Governor of the Federal Reserve Bank of Boston, May 14, 1920
United States. Department of the Treasury. "Letter from R.C. Leffingwell to Charles A. Morss, Governor of the Federal Reserve Bank of Boston, May 14, 1920," in United States. Department of the Treasury. "Volume 1A," Press Releases of the United States Department of the Treasury (March 30, 1918 - December 26, 1921) : 161-169. https://fraser.stlouisfed.org/title/6111/item/586836/toc/558002 , accessed on September 22, 2023.