LITERATURE CITED
- Haase, E. F. 1975. Guayule: A rubber-producing shrub for arid and semiarid regions. Arid Land Resources Inform. Paper 7. Office of Arid Land Studies, The University of Arizona, Tucson. 267 p.
- Hammond, B. L., and L. G. Polhamus. 1965. Research on guayule 1942–1959. USDA Techn. Bull. 1327: 1–157.
- Phillips, J. M., and D. S. Hayman. 1970. Improved procedures for clearing roots and staining parasitic and vesicular-arbuscular mycorrhizal fungi for rapid assessment of infection. Trans. Brit. Mycol. Soc. 55: 158–160.
- Shive, J. W., and W. R. Robbins. 1937. Methods of growing plants in solution and sand cultures. New Jersey Agric. Exp. Sta. Bull. 636: 1–24.