Multiple entries were found for '66 FR 23646'
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- Approval and Promulgation of Air Quality Implementation Plans; District of Columbia; Oxygenated Gasoline Program
- Clean Air Act Reclassification and Notice of Potential Eligibility for Extension of Attainment Date, Louisiana; Baton Rouge Ozone Nonattainment Area
Federal Register citations are by volume and page number. Volume maps directly to the year of publication, with 1994 being 59, and 2009 being 74.