19 U.S.C. § 48
Section, acts Mar. 4, 1923, ch. 251, §5, 42 Stat. 1454; June 17, 1930, ch. 497, title IV, §645(b), 46 Stat. 761, related to travel, subsistence, and transportation expenses of customs officers and employees. These provisions are covered generally in chapter 57 of Title 5, Government Organization and Employees.