CFR > Title 48 > Chapter 2 > Subchapter G > Part 251 48 CFR Part 251 – Use of Government Sources by Contractors Current as of: 2024 | Check for updates | Other versions Subpart 251.1 Contractor Use of Government Supply Sources Subpart 251.2 Contractor Use of Interagency Fleet Management System (Ifms) Ask a legal question, get an answer ASAP!Click here to chat with a lawyer about your rights.