| Abbott Laboratories Atlantic Richfield Foundation Amoco Foundation, Inc. Amoco Oil Corporation Annexter Brothers, Inc. Ash, Anos, Freedman & Logan Badger Meter, Inc. Borg-Warner Foundation The Brunswick Foundation, Inc. Campanella & Sons, Inc. J.I. Case Caterpillar Foundation Caterpillar Tractor Company Chauncey and Marion Deering-McCormick Foundation Chicago Community Trust City of Chicago, Dept. of Aviation Commonwealth Edison Company Cook County Anthony T. and Lawrie C. Dean R.R. Donnelley & Sons Company Gaylord and Dorothy Donnelley Foundation Gaylord Donnelley1983 Gift Trust Exxon Company, U.S.A. Garden Guild, Winnetka, Illinois Hartz Construction Co., Inc. Sidney G. Haskins Illinois Department of Energy and Natural Resources The Indevco Group Industrial Towel & Uniform, Inc. |
International Minerals & Chemical Corporation The Joyce Foundation Kelso-Burnett Co. Lake County Forest Preserve District Land and Lakes Company The John D. and Catherine T. MacArthur Foundation Material Service Corporation The McKnight Foundation MidCon Corporation Morton Arboretum The Curtis and Edith Munson Foundation National Terminals Corporation Northern Illinois Gas Olson Oil Company Openlands Project Parikh Family Investment Management Corporation Palwaukee Municipal Airport Prince Charitable Trusts Sudix Foundation Sundance Homes USX Foundation Inc. U.S. Army Corps of Engineers U.S. Environmental Protection Agency U.S. Fish and Wildlife Service U.S.D.A. Soil Conservation Service Walgreen Company Waste Management of North America-Midwest Western Development Corporation |
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