United States. Department of the Treasury. "Precious Metals," in United States. Department of the Treasury. "Annual Report of the Secretary of the Treasury on the State of the Finances for the Year 1892," Annual Report of the Secretary of the Treasury on the State of the Finances (1892) : 31-33. https://fraser.stlouisfed.org/title/194/item/5538/toc/223412 , accessed on April 19, 2024.