Quadrangle Maps
| Chillicothe | Surficial Geology | 2007 |
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| Coal Valley | Bedrock Geology | 2021 |
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| Cobden | Geology | 1995 |
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| Colfax | Surficial Geology | 2015 |
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| Collinsville | Surficial Geology | 2004 |
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| Collinsville | Bedrock Geology | 2001 |
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| Collinsville | Bedrock Topography |
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| Columbia | Surficial Geology | 2009 |
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| Columbia | Bedrock Topography | 2008 |
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| Columbia | Sinkhole Density and Distribution | 2008 |
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