United States. Department of the Treasury. "Investigations Ordered by the Department," in United States. Department of the Treasury. "Annual Report of the Secretary of the Treasury on the State of the Finances for the Year 1885, Volume II: Collection of Duties," Annual Report of the Secretary of the Treasury on the State of the Finances (1885) : 5-7. https://fraser.stlouisfed.org/title/194/item/5529/toc/125076 , accessed on July 16, 2024.