https://www.abebooks.com/9780472082803/Geology-Michigan-John-Dorr-Donald-0472082809/plp
Geology of Michigan - John A. Dorr; Donald F. Eschman: 9780472082803 - AbeBooks
In the eons before the first man set foot on Michigan soil, ancient mountain ranges yielded to the slow but irresistible forces of erosion and slipped beneath...
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