Based on title 33, U.S.C., 1946 ed., § 721a (Aug. 16, 1937, ch. 665, § 2, 50 Stat. 667).

Changes were made in phraseology. 81st Congress, House Report No. 557.

2018—Pub. L. 115–282 renumbered section 642 of this title as this section.