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Anchor text: Coal in Illinois
Anchor text: Illinois State Geological Survey Surficial Geology of the Chicago Region: Berwyn Quadrangle {{!
Anchor text: IL MINES Redirect
Anchor text: Bedrock Geology of Gorham Quadrangle: Jackson County, Illinois
Anchor text: Bedrock Geology of Altenburg Quadrangle: Jackson County, Illinois and Perry County, Missouri
Anchor text: biography
Anchor text: ISGS
Anchor text: Argentinian Quaternary Geologist Jorge Rabassa to Return to ISGS in 2015