United States. Bureau of the Budget and United States. Office of Management and Budget. "Part IV. Special Analyses," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year Ending June 30, 1956," Budget of the United States Government (January 17, 1955) : 1230-1231. https://fraser.stlouisfed.org/title/54/item/19009/toc/351126 , accessed on April 25, 2024.