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| Beetles, Fossil. (1) |
| Glacial epoch -- Agassiz, Lake. (1) |
| Paleoclimatology -- Minnesota -- Moorhead. (1) |
| Paleoclimatology -- North Dakota -- Fargo. (1) |
| Paleoecology -- Minnesota -- Moorhead. (1) |
| Paleoecology -- North Dakota -- Fargo. (1) |