United States. Department of the Treasury. "Annual Report of the Secretary of the Treasury on the State of the Finances for the Fiscal Year Ended June 30, 1975 : Statistical Appendix," Annual Report of the Secretary of the Treasury on the State of the Finances (Fiscal Year Ended June 30, 1975). https://fraser.stlouisfed.org/title/194/item/5616, accessed on August 15, 2024.