CHAPTER 12—RIVER AND HARBOR IMPROVEMENTS GENERALLY (§§ 540—633)
- SUBCHAPTER I—GENERAL PROVISIONS (§§ 540—579a)
- SUBCHAPTER II—PAY AND ALLOWANCES; TRAVELING EXPENSES AND SUBSISTENCE (§§ 581—584,_584a)
- SUBCHAPTER III—ACQUISITION OF LAND AND MATERIALS (§§ 591—598)
- SUBCHAPTER IV—PARTICULAR WORK OR IMPROVEMENTS (§§ 601—610)
- SUBCHAPTER V—PROSECUTION OF WORK GENERALLY (§§ 621—633)