Author & Contributor Index
- Illinois Clean Coal Institute
- Illinois Coal Development Board
- Illinois Coal Industry Committee
- Illinois. Coal mining investigations (Cooperative agreement)
- Illinois. Coal mining investigations. (Co-operative agreement.)
- Illinois Coal Research Board
- Illinois Coal Strippers Association
- Illinois Collections Preservation Network
- Illinois Connecting to Collections partners
- Illinois Cooperative Collection Management Program
- Illinois Council on Food and Agricultural Research
- Illinois Custom Spray Operators' School
- Illinois Department of Conservation
- Illinois. Department of Conservation
- Illinois. Department of Conservation. Division of Fisheries
- Illinois Department of Energy and Natural Resources
- Illinois Department of Energy and Natural Resources
- Illinois. Department of Energy and Natural Resources. Hazardous Waste Research and Information Center
- Illinois. Department of Energy and Natural Resources. Hazardous Waste Research and Information Center (IENR DENR ENR HWRIC)
- Illinois. Department of Energy and Natural Resources. Hazardous Waste Research and Information Center (ILENR DENR ENR HWRIC)
- Illinois Department of Energy and Natural Resources, Illinois State Water Survey
- Illinois. Department of Energy and Natural Resources. Office of Research and Planning
- Illinois. Department of Energy and Natural Resources. State Geological Survey. (ENR DENR ILENR SGS ISGS)
- Illinois. Department of Local Government Affairs
- Illinois. Department of Local Government Affairs. Office of Housing and Buildings
- Illinois Department of Natural Resources
- Illinois. Department of Natural Resources. Division of Fisheries
- Illinois. Department of Natural Resources. Illinois State Geological Survey
- Illinois Department of Natural Resources, Illinois State Water Survey
- Illinois Department of Natural Resources. Office of Resource Conservation
- Illinois. Department of Natural Resources. Office of Resource Conservation
- Illinois Department of Natural Resources, Office of Scientific Research
- Illinois Department of Natural Resources. Office of Scientific Research and Analysis
- Illinois Department of Natural Resources, State Geological Survey Division
- Illinois Department of Natural Resources. State Geological Survey Division
- Illinois. Department of Natural Resources. Waste Management and Research Center. (DNR WMRC)
- Illinois. Department of Natural Resources. Waste Management and Research Center. (ILENR DENR ENR HWRIC)
- Illinois Department of Registration and Education
- Illinois. Department of Registration and Education
- Illinois. Department of Resources. Waste Management and Research Center. Load Reduction Program. (ILENR ENR DENR HWRIC)
- Illinois. Department of Transportation
- Illinois. Department of Transportation. Bureau of Materials and Physical Research
- Illinois. Department of Transportation. Wetlands Unit
- Illinois Deptartment of Natural Resources
- Illinois Deptartment of Natural Resources Office of Realty and Environmental Planning
- Illinois. Division of Fisheries
- Illinois. Division of Highways
- Illinois. Division of Natural Heritage
- Illinois Division of Water Pollution Control
- Illinois. Division of Water Resources.