1. Barrie, L.A.:1985, Unpublished data.
2. Cronan, C.S.:1980, Oikos 34, 272.
3. Federer, C.A.:1983, Soil Sci. Soc. Am. J. 47, 1008.
4. Foster, N.W.:1985, For. Ecol. Manage. 12, 215.
5. Foster, N.W. and Nicolson, J.A.:1984, ?Acid Precipitation and Water Quality within a Tolerant Hardwood Stand and Soil?, in:Speeches and Papers. Forest Resources Management, The Influence of Policy and Law.Internat'l For. Congr., Quebec City, p. 337.