United States. Bureau of the Budget and United States. Office of Management and Budget. "Direct Obligations for Principal Statistical Programs By Agency," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year Ending June 30, 1964," Budget of the United States Government (January 17, 1963) : 418-418. https://fraser.stlouisfed.org/title/54/item/19017/toc/269512 , accessed on April 19, 2024.