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Johnson, D.W. and S.E. Lindberg. 1992. Atmospheric Deposition and Forest Nutrient Cycling. Springer-Verlag, New York.

Johnson, D.W. and R.I. Van Hook. 1989. Analysis of Biogeochemical Cycling Processes in Walker Branch Watershed. Springer- Verlag, New York.

Likens, G.E., F.H. Bormann, R.S. Pierce, J.S. Eaton and N.M. Johnson. 1977. Biogeochemistry of Forested Ecosystems. Springer-Verlag, New York.

Schlesinger, W.H. 1991. Biogeochemistry - An Analysis of Global Change. Academic Press, New York.

Waring, R.H. and W.H. Schlesinger. 1985. Forest Ecosystems - Concepts and Management. Academic Press, New York.