Author & Contributor Index
- Ilg, George Martin Aloysius
- Ilhan, Aylin
- Ilhan, Behice E.
- Ilhan, Okan
- Ilica, Beliz
- Ilic, M.
- Ilic, S.M.
- Ilievski, Petar Hr.
- Ilinca, Ingrid L.
- Ilin, Yelena
- Ilio, Kenneth Yerro
- Iliopoulos, Ilias
- Iliou, Dimitrios
- Illc-Spong, M.
- Illerbrun, David William
- Illini Achievement Fund
- Illinois Agricultural Pesticides Conference. Spray School
- Illinois-American Water Company
- Illinois Archeological Survey
- Illinois Basin Consortium
- Illinois Biochar Group
- Illinois. Board of Higher Education
- Illinois. Board of Natural Resources and Conservation
- Illinois. Bureau of Location and Environment
- Illinois Business Consulting
- Illinois Center for Aquatic Ecology
- Illinois Clay Products Company. Joliet
- 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)