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| Geology -- United States --Maps (2) |
| Geology--South Dakota--Maps (2) |
| Proterozoic - Sioux quartzite (2) |
| Cretaceous - Colorado group (1) |
| Cretaceous - Colorado group; Dakota formation (1) |
| Neogene - Gary moraine (1) |
| Neogene - Gary moraine; Altamont moraine (1) |