Revision of Internal Taxes, Summary of Statement by the Secretary of the Treasury for the Committee on Ways and Means, August 4, 1921
United States. Department of the Treasury. "Revision of Internal Taxes, Summary of Statement by the Secretary of the Treasury for the Committee on Ways and Means, August 4, 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) : 358-369. https://fraser.stlouisfed.org/title/6111/item/586836/toc/558043 , accessed on September 22, 2023.