“Section 503 of title 40” substituted in text for “section 201(c) of the Act of June 30, 1949 (40 U.S.C. 481(c))” on authority of Pub. L. 107–217, § 5(c), Aug. 21, 2002, 116 Stat. 1303, the first section of which enacted Title 40, Public Buildings, Property, and Works.

Section was formerly classified to section 170l of Title 5 prior to the general revision and enactment of Title 5, Government Organization and Employees, by Pub. L. 89–554, § 1, Sept. 6, 1966, 80 Stat. 378.