Post Office Department
United States. Bureau of the Budget and United States. Office of Management and Budget. "Post Office Department," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year Ending June 30, 1923 : Alternative Budget," Budget of the United States Government (December 5, 1921) : 660-674. https://fraser.stlouisfed.org/title/54/item/18965/toc/60254 , accessed on April 19, 2024.