CFR›Title 7›Subtitle B›Chapter I›Part 51›Subpart V›Subject Group Grades ContainsSections 51.2075–51.2078CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Sections 51.2075 § 51.2075 U.S. No. 1. 51.2076 § 51.2076 U.S. No. 1 Mixed. 51.2077 § 51.2077 U.S. No. 2. 51.2078 § 51.2078 U.S. No. 2 Mixed. Previous Determination of Grade Determination of Grade