REFERENCES
- Cady, John, and Basil A. Woon 1915 Arizonas Yesterday. Privately printed (Tucson?).
- Hitchcock, A. S. 1950 Manual of the Grasses of the United States. Department of Agriculture, Miscellaneous Publication No. 200.
- Kearney, Thomas H., and Robert H. Peebles 1960 Arizona Flora. University of California Press, Berkeley and Los Angeles.
- Schulman, Edmund 1956 Dendroclimatic Changes in Semiarid America. The University of Arizona Press, Tucson.