1. The Sangamonian Pointe-Fortune site, Ontario–Quebec border;Anderson;Géographie Physique et Quaternaire,1990
2. A late Wisconsin Coleopterous assemblage from southern Ontario and its environmental significance;Ashworth;Canadian Journal of Earth Sciences,1977
3. Quaternary Coleoptera of the United States and Canada;Ashworth,2004
4. The Johns Lake site: a late Quaternary fossil beetle (Coleoptera) assemblage from the Missouri Coteau of North Dakota;Ashworth;North Dakota Geological Survey Miscellaneous Series,1992
5. Plant and insect fossils at Norwood in south-central Minnesota: a record of late-glacial succession;Ashworth;Quaternary Research,1981