1. B. W. Bache, this symposium.
2. B. W. Bache, Articles on Base Saturation and Soil Reaction in: “Encyclopedia of Soil Science”, Dowden, Hutchinson and Ross, Stroudsburg, Pa. (In Press).
3. R. W. Pearson, and F. Adams, eds. “Soil Acidity and Liming”, Amer. Soc. Agron., Madison, Wis. (1967).
4. R. C. Turner, W. E. Nichol and J. E. Brydon, Soil Sci., 95: 186 (1963).
5. T. Rosenqvist, Report to the Norwegian Council for Scientific Research (1976).