Harding, W. P. G. (William Proctor Gould), 1864-1930. "Statement by Governor Harding, July 6, 1918," 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) : 10-13. https://fraser.stlouisfed.org/title/6111/item/586836/toc/557970 , accessed on September 22, 2023.