United States. Bureau of the Budget and United States. Office of Management and Budget. "Principal Federal Statistical Programs," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year Ending June 30, 1965," Budget of the United States Government (January 21, 1964) : 432-435. https://fraser.stlouisfed.org/title/54/item/19018/toc/235146 , accessed on March 29, 2024.