1. Neogene and Quaternary lacustrine diatom biochronology, western USA;WN Krebs;Palaios,1987
2. Krebs WN. The biochronology of freshwater planktonic diatom communities in western North America. In: Kociolek JP, editor. Proceedings of the 11th International Diatom Symposium San Francisco. Memoirs of California Academy of Sciences 17; 1994. pp. 485–499.
3. Proceedings of the 10th International Diatom Symposium;LP Loginova,1990
4. Fossil continental diatoms: paleolimnology, evolution, and biochronology;JP Bradbury;Siliceous microfossils (Short Courses in Paleontology 8),1995
5. Geologic Ranges of Lacustrine Actinocyclus Species, Western United States;WN Krebs;United States Geological Survey Professional Paper,1995