1. The American species of Asterophyllites, Annularia, and Sphenophyllum;Abbott;Bulletins of American Paleontology,1958
2. Fire Ecology of Pacific Northwest Forests;Agee,1993
3. A new method for non-parametric multivariate analysis of variance;Anderson;Austral Ecology,2001
4. Fossil flora of the Michigan Coal Basin;Arnold;Contributions from the Museum of Paleontology, University of Michigan,1949
5. Floristic zonation of tree communities on wet tropical mountains revisited;Ashton;Perspectives in Plant Ecology, Evolution and Systematics,2003