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Geology -- United States --Maps (4) |
Geology--South Dakota--Maps (4) |
Cretaceous - Colorado group; Dakota formation (3) |
Neogene - Gary moraine (2) |
Neogene - Gary moraine; Altamont moraine (2) |
Proterozoic - Sioux quartzite (2) |
Cretaceous - Colorado group (1) |