Cooperative Federalism Under the Clean Air Act: State Perspectives April 10, 2018 10:00 AM Nancy Vehr Division of Air Quality, Wyoming Department of Environmental Quality, Cheyenne, WY Related Files Vehr Testimony 04.10.2018.pdf (487.7 KBs) Return to Hearing Related Files SPW 041018.pdf (188.8 KBs) Permalink: https://www.epw.senate.gov/public/index.cfm/2018/4/cooperative-federalism-under-the-clean-air-act-state-perspectives