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Published online by Cambridge University Press: 24 August 2009
* See also comments in recent issues of Environmental Conservation, including Vol. 3, No. 4, p. 258, 1976; Vol. 4, No. 1, p. 68, 1977; Vol. 4, No. 3, p. 236, 1977; and Vol. 5, No. 2, p. 146, 1978.—Ed.