CFR›Title 40›Chapter I›Part 272›Subpart NN ContainsSection 272.1950CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart NN—Pennsylvania Sections 272.1950-272.1999 §§ 272.1950-272.1999 [Reserved] Previous N Subpart N—Idaho Next O Subpart O—Illinois