Montana Power Co. et al. v. United States Environmental Protection Agency et al.; American Petroleum Institute et al. v. United States Environmental Protection Agency et al.; Indiana-Kentucky Electric Corp. et al. v. United States Environmental Protection Agency et al.; Alabama Power Co. et al. v. United States Environmental Protection Agency et al.; Utah Power & Light Co. et al. v. United States Environmental Protection Agency et al.; and Western Energy Supply & Transmission Associates et al. v. United States Environmental Protection Agency et al.

No. 76-529. No. 76-585. No. 76-594. No. 76-603. No. 76-619. No. 76-620. Montana Power Co. et al. v. United States Environmental Protection Agency et al.; American Petroleum Institute et al. v. United States Environmental Protection Agency et al.; Indiana-Kentucky Electric Corp. et al. v. United States Environmental Protection Agency et al.; Alabama Power Co. et al. v. United States Environmental Protection Agency et al.; Utah Power & Light Co. et al. v. United States Environmental Protection Agency et al.; and Western Energy Supply & Transmission Associates et al. v. United States Environmental Protection Agency et al. [MAJORITY] C. A. D. C. Cir. Certiorari granted limited to the following questions: 1. Whether regulations promulgated by the Environmental Protection Agency to prevent the significant deterioration of air quality are authorized by the Clean Air Act; 2. Whether the Clean Air Act permits the Environmental Protection Agency to adopt regulations which grant to federal land managers and Indian governing bodies power to reclassify federal and Indian lands within their jurisdiction. Cases consolidated and a total of one and one-half hours allotted for oral argument. Mr. Justice Powell took no part in the consideration or decision of these petitions. Reported below: 176 U. S. App. D. C. 335, 540 F. 2d 1114.