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1. Aquifer Sensitivity to Contamination by Nitrate Leaching in Illinois [IGDNR_NO3AQSENS]   CHILD DIFs
This data set was designed for statewide evaluation of agrichemical leaching characteristics and associated aquifer sensitivity to contamination. It was created to classify soils ...


2. Aquifer Sensitivity to Contamination by Pesticide Leaching in Illinois [IGDNR_PESTAQSENS]   CHILD DIFs
This data set was designed for statewide evaluation of agrichemical leaching characteristics and associated aquifer sensitivity to contamination. It was created to classify soils ...


3. Critical Trends Assessment Land Cover Database of Illinois, 1991-1995 [IGDNR_LANDCOV]
County by county land cover grid data for Illinois derived from Thematic Mapper (TM) Satellite data from the Landsat 4 sensor. Dates of the imagery used range from April, 1991 to May, ...


4. Major Bedrock Aquifers at Depths Greater Than 500 Feet Below Ground Surface [IGDNR_AQMBG500]
This map shows the distribution of major bedrock aquifer units at depths greater than 500 feet below ground surface in Illinois. Major aquifers are capable of yielding 70 gallons of water ...


5. Major Sand and Gravel Aquifers in Illinois [IGDNR_AQMSG]
This map shows the distribution of major sand and gravel aquifers at any depth in Illinois. Generally, the tops of such aquifers lie within 300 feet of the surface and the bases occur ...


6. Nitrate Leaching Class Ranges [IGDNR_NO3LRANGE]   PARENT DIF
This is a statewide Arc/Info data set of nitrate leaching class ranges for soils in Illinois. It was generated to aid in determining aquifer sensitivity to nitrate leaching in Illinois. ...


7. Nitrate Leaching Classes of Illinois Soils [IGDNR_NO3LEACH]   PARENT DIF
This data set was designed for statewide evaluation of agrichemical leaching characteristics and associated aquifer sensitivity to contamination. It was created to classify soils ...


8. Oil and Gas Pipelines and Facilities in Illinois - Lines [IGDNR_PIPELINE]
Created in 1984 by ESRI to show distribution of oil and gas pipelines in Illinois. This Arc/Info coverage consists of line data representing oil and gas pipeline locations ...


9. Pesticide Leaching Classes of Illinois Soils [IGDNR_PESTLEACH]   PARENT DIF
This data set was designed for statewide evaluation of agrichemical leaching characteristics. It was created to classify soils and aquifer settings according to predictions of leaching ...


10. Physiographic Divisions of Illinois [IGDNR_PHYSIO]
This data set records information about the Physiographic divisions of Illinois. The data set was digitized so that it could be included as an inset map on the 'Shaded Relief Map ...


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