[Code of Federal Regulations] [Title 48, Volume 4] [Revised as of October 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 48CFR416.603-4] [Page 117] TITLE 48--FEDERAL ACQUISITION REGULATIONS SYSTEM CHAPTER 4--DEPARTMENT OF AGRICULTURE PART 416_TYPES OF CONTRACTS--Table of Contents Subpart 416.6_Time-and-Materials, Labor-Hour, and Letter Contracts Sec. 416.603-4 Contract clauses. The contracting officer shall insert the clause at 452.216-75, Letter Contract, in a definitive contract superseding a letter contract.