CFR › Title 42 › Part 137 › §137.29642 CFR §137.296Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkSelf-Governance Tribes comply with NEPA and the NHPA by adopting and following:(a)their own environmental review procedures;(b)the procedures of the IHS; and/or(c)the procedures of another Federal agency.