1. Great Canadian Lagerstätten 1. Early Eocene Lagerstätten of the Okanagan Highlands (British Columbia and Washington State);Archibald;Geosci. Can.,2011
2. Oligocene plants from the Upper Ruby River Basin, southwestern Montana;Becker,1961
3. New Paleogene paleoclimate analysis of western Washington using physiognomic characteristics from fossil leaves;Breedlovestrout;Rev. Palaeobot. Palynol.,2013
4. New species and changes of name in some American fossil plants;Brown;J. Wash. Acad. Sci.,1940
5. Paleoecological and floristic heterogeneity in the plant-fossil record – an analysis based on the Eocene of Washington;Burnham,1994