Landcover

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  Forest Cover of Illinois in 1820
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  Illinois Gap Analysis Program: Land Cover Classification, 1999-2000
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  Illinois Landcover in the Early 1800s
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  Land Cover of Illinois 1999-2000 Data
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  USDA-NASS Cropland Data Layer Illinois 1999-2006
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  USDA-NASS Cropland Data Layer Illinois 2007