PCB 88-196

		PCB 88-196 04/06/89 Order KOPPERS INDUSTRIES, INC. v. ILLINOIS ENVIRONMENTAL PROTECTION AGENCY
		PCB 88-196 05/25/89 Opinion and Order KOPPERS INDUSTRIES, INC. v. ILLINOIS ENVIRONMENTAL PROTECTION AGENCY
		PCB 88-196 12/15/88 Order KOPPERS COMPANY, INC. (Chicago Tar Plant) v. ILLINOIS ENVIRONMENTAL PROTECTION AGENCY