1. Ausmus, B. S., Edwards, N. T. and Witkamp, M.: 1977, in A. MacFadyen and J. M. Anderson (eds.), Proceedings of the British Ecological Society Symposium on Decomposition. Blackwell Scientific Press, Oxford, in press.
2. Barrett, G. W., Van Dyne, G. M., and Odum, E. P.: 1976, Bloscience 26,192.
3. Bormann, F. H. and Likens, G. E.: 1967, Science 155, 424.
4. Christensen, S. W., Van Winkle, W., and Mattice, J. S.: 1977, in R. K. Sharma, J. D. Buffington, and J. T. McFadden (eds.), The biological significance of environmental impacts. Energy Research and Development Administration, Washington, D.C., in press.
5. Council on Environmental Quality: 1973, Preparation of environmental impact statement: Guidelines 38, Federal Register, pp. 20550?20562.