SUBPART 51.1 – CONTRACTOR USE OF GOVERNMENT SUPPLY SOURCES (Revised October 24, 2016 through PROCLTR 2016-10) 51.100 Scope of subpart.51.101 Policy.51.102 Authorization to use Government supply sources.51.102-90 Special requirements.51.103-90 Ordering from Government supply sources.Parent topic: PART 51 – USE OF GOVERNMENT SOURCES BY CONTRACTORS