[Code of Federal Regulations] [Title 48, Volume 1] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 48CFR16.603] [Page 315] TITLE 48--FEDERAL ACQUISITION REGULATIONS SYSTEM CHAPTER 1--FEDERAL ACQUISITION REGULATION PART 16--TYPES OF CONTRACTS--Table of Contents Subpart 16.6--Time-and-Materials, Labor-Hour, and Letter Contracts Sec. 16.603 Letter contracts.