R 77-009

		R 77-009 / PCB 79-007 02/01/79 Order ILLINOIS POWER CO. v. ENVIRONMENTAL PROTECTION AGENCY
		R 77-009 02/03/77 Order IN THE MATTER OF PROPOSED RULE 204.1 OF THE AIR POLLUTION CONTROL REGULATIONS
		R 77-009 07/06/78 Order IN THE MATTER OF PROPOSED RULE 204.1 OF THE AIR POLLUTION CONTROL REGULATIONS