CFR›Title 23›Chapter I›Part 633 ContainsSubparts A–BCorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 PART 633—REQUIRED CONTRACT PROVISIONS Subparts A Subpart A—Federal-Aid Construction Contracts (Other Than Appalachian Contracts) Sections 633.101–633.104 B Subpart B [Reserved] Authority23 U.S.C. 114 and 315; 49 CFR 1.48. Previous 630 Part 630—Preconstruction Procedures Next 635 Part 635—Construction and Maintenance