1. Anonymous (1978). The Canadian system of soil classification. Can. Dept. Agri. Publ. 1646. Supply and Services Canada, Ottawa, Ont.
2. Antonovics, J., Bradshaw, A. D., and Turner, R. G. (1971). Heavy metal tolerance in plants. Adv. Ecol. Res. 71.
3. Becker, W. A. (1984). Manual of Quantitative Genetics 4th ed., Academic Enterprises, Pullman, Wash.
4. Bell, H. E., Stettler, R. F., and Stonecypher, R. W. (1979). Family × fertilizer interaction in one-year-old Douglas-fir. Silvae Genet. 281.
5. Bertin, E. P. (1978). Introduction to X-Ray Spectrometric Analysis Plenum, New York.