Letter from Secretary Houston to John J. Esch, Chairman of the Committee on Interstate and Foreign Commerce, January 13, 1921
United States. Department of the Treasury. "Letter from Secretary Houston to John J. Esch, Chairman of the Committee on Interstate and Foreign Commerce, January 13, 1921," 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) : 306-322. https://fraser.stlouisfed.org/title/6111/item/586836/toc/558028 , accessed on September 22, 2023.