1. Scrubb, L. A., Chakravorty, A. K., and Shaw, M., Pl. Physiol. 50, 73 (1972).
2. Loegering, W. Q., and Harmon, D. L., Phytopathology 59, 456 (1969).
3. Seevers, P. M., and Daly, J. M., Phytopathology 60, 1322 (1970).
4. Stakman, E. C., Stewart, D. M., and Loegering, W. Q., Identification of physiologic races of Puccinia graminis var. trictica, E 617 (USDA Publication, 1962).
5. Williams, P. G., Scott, K. G., Kuhl, J. L., and MacLean, D. J., Phytopathology, 57, 236 (1967).