Illinois Natural Resources Geospatial Data Clearinghouse
Download GIS data and imagery for Illinois free of charge. Available data sets and documentation (metadata) include: geology, water resources, nature preserves, wildlife areas, land use, political boundaries, roads, census information, Public Land Survey, Digital Raster Graphics (DRG) files, Digital Orthophoto Quarter (DOQ) Quadrangles, and 2000 Orthoimagery for the Des Plaines River Watershed.
www.isgs.uiuc.edu/nsdihome/ISGSindex.html   reviews

The Tallgrass Prairie in Illinois
The Tallgrass Prairie in Illinois Kenneth R. Robertson Illinois Natural History Survey Contents Introduction What is a Prairie Formation of Prairies Settlement of Prairies Types of Prairies in Illinois Biodiversity in Prairies Prairie Plants Where to See Prairies Landscaping with Prairie Plants Prairie Restoration Conclusion Acknowledgements List of Published References on Prairies Links to ...
www.inhs.uiuc.edu/~kenr/tallgrass.html   reviews

Nitrogen Cycles Project
The Nitrogen Cycles Project provides an improved scientific basis for developing and testing mathematical process models. These models simulate the biogeochemical cycling of nitrogen in Illinois' environments, and are also used for conducting N mass-balance studies.
www.sws.uiuc.edu/nitro/splash.asp   reviews