In par. (b), “subchapter I of chapter 57 of title 5, or section 5731 (a) of title 5” substituted for “the Travel Expense Act of 1949, or section 10 of the Act of March 3, 1933 (U.S.C., title 5, sec. 73b)” on authority of Pub. L. 89–554, § 7(b), Sept. 6, 1966, 80 Stat. 631, the first section of which enacted Title 5, Government Organization and Employees.

In par. (c), “section 501 of title 44” substituted for “section 11 of the Act of March 1, 1919 (U.S.C., title 44, sec. 111)” on authority of Pub. L. 90–620, § 2(b), Oct. 22, 1968, 82 Stat. 1305, the first section of which enacted Title 44, Public Printing and Documents.