Transcript
Source: United State Geological Survey. 2017. Illinois. Fact Sheet FS‐014‐99. Accessed October 4, 2017. https://pubs.usgs.gov/fs/FS‐014‐99/pdf/fs‐014‐99.pdf
Source: United State Geological Survey. 2017. Illinois. Fact Sheet FS‐014‐99. Accessed October 4, 2017. https://pubs.usgs.gov/fs/FS‐014‐99/pdf/fs‐014‐99.pdf