{"data":{"id":"us/40-cfr-81.424","jurisdiction":"us","citation":"40 CFR 81.424","heading":"Oklahoma.","body":"Area name Acreage Public Law establishing Federal land manager\nWichita Mountains Wild 8,900 91-504 USDI-FWS","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES","Subpart D—Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"f2f90beae31cf2f484d7076bdc5dbc17e1f00f18ba2340a503ac930b5bc3e409","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-81.423","next":"us/40-cfr-81.425"},"notice":"GroundRules: Original legal text. Not legal advice."}