1. Anderson, R. C. 1982. An evolutionary model summarizing roles of fire, climate, and grazing animals in the origin and maintenance of grasslands: An end paper. Pages 297–308in J. R. Estes, R. J. Tyrl and J. N. Brunken (eds.), Grasses and grasslands: Systematics and evolution. Oklahoma University Press, Norman, Oklahoma.
2. Anderson, R. Y. and D. W. Kirkland. 1969. Paleoecology of an early Pleistocene lake on the High Plains of Texas. Mem. Geol. Soc. Amer.113.
3. Anonymous. 1942. Record survival made by shelterbelt trees. J. Forestry40(6): 456.
4. Axelrod, D. I. 1950. Evolution of desert vegetation in western North America. Publ. Carnegie Inst. Wash.590: 217–306.
5. — 1977. Outline history of California vegetation. Pages 140–193in M. G. Barbour and J. Major (eds.), Terrestrial vegetation of California. John Wiley and Sons, New York.