Illinois State Geological Survey
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Guide to Rocks and Minerals of Illinois
Explore the hidden world of a Midwestern state's geological treasures, unearthing secrets of ancient formations and unearthing gems of the earth.
By Illinois State Geological Survey
Guide to the Geologic Map of Illinois
Unearth the secrets of Illinois's ancient landscape and the hidden treasures shaped by glaciers long ago.
By Illinois State Geological Survey
Inside Illinois: Mineral Resources
Uncover the hidden riches beneath Illinois as this book reveals the geological history and mineral wealth that shaped the state's economy.
By Illinois State Geological Survey