40 CFR 63.1341 : Protection Of Environment (§ 1.1 To Parts 1851-1899) — (§ 63.1200 To § 63.1439) — Environmental Protection Agency (Continued) (§ 63.1200 To § 63.1439) — Air Programs (Continued) (§ 63.1200 To § 63.1439) — National Emission Standards For Hazardous Air Pollutants For Source Categories (Continued) (§ 63.1200 To § 63.1439) — National Emission Standards For Hazardous Air Pollutants From The Portland Cement Manufacturing Industry (§ 63.1340 To § 63.1359) — General (§ 63.1340 And § 63.1341) — Definitions.