2003. Illinois State Geological Survey. This line data layer represents county boundaries for Illinois in 2003. The dataset was originally published by the Illinois State Geological Surve... Illinois State Geological Survey.
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2003. City of Chicago Innovation and Technology Department-GIS Program. This line data layer represents the CTA lines for Chicago, Illinois in 2003. The dataset was originally published by the City of Chicago Innovation...
2003. City of Chicago Innovation and Technology Department-GIS Program. This line data layer represents major streets for Chicago, Illinois in 2003. The dataset was originally published by the City of Chicago Innovation...