Versions of 22 CFR Part 161 - Regulations for Implementation of the National Environmental Policy Act (Nepa) on LawServer 2024 22 CFR Part 161 – Regulations for Implementation of the National Environmental Policy Act (Nepa) 2023 22 CFR PART 161 – REGULATIONS FOR IMPLEMENTATION OF THE NATIONAL ENVIRONMENTAL POLICY ACT (NEPA) 2022 22 CFR Part 161 – Regulations for Implementation of the National Environmental Policy Act (NEPA) 2021 22 CFR Part 161 – Regulations for Implementation of the National Environmental Policy Act (NEPA) 2020 22 CFR Part 161 – Regulations for Implementation of the National Environmental Policy Act (Nepa)