1. Ashworth, A.C., Schwert, D.P., 1992. The Johns Lake site: A late Quaternary fossil beetle (Coleoptera) assemblage from the Missouri Coteau of North Dakota. North Dakota Geological Survey Miscellaneous Series No. 76, pp. 257–265.
2. Holocene history of prairie in midwestern United States: pollen versus plant macrofossils;Baker;Ecoscience,1994
3. Quaternary pollen records from the Great Plains and central United States;Baker,1985
4. Postglacial vegetation and climate in the northwestern Great Plains of Montana;Barnosky;Quaternary Research,1989
5. Towards a postglacial history of the northern Great Plains: a review of the paleoecologic problems;Barnosky;Annals of Carnegie Museum,1987