United States. Department of the Treasury. "Letter from Secretary Mellon to Frank Oliver, April 23, 1926," in United States. Department of the Treasury. "Volume 4A," Press Releases of the United States Department of the Treasury (January 4, 1926 - December 10, 1927) : 13-15. https://fraser.stlouisfed.org/title/6111/item/586842/toc/558066 , accessed on April 19, 2024.