United States. Department of the Treasury. "Abstract Report of the Superintendent of the United States Coast Survey," in United States. Department of the Treasury. "Annual Report of the Secretary of the Treasury on the State of the Finances for the Year 1878," Annual Report of the Secretary of the Treasury on the State of the Finances (1878) : 639-643. https://fraser.stlouisfed.org/title/194/item/5522/toc/112919 , accessed on July 16, 2024.