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soil erosion
D. Harvey, C. Resosudarmo, P. 1995. Environmental and economic costs of soil erosion and conservation benefits. Science v. 267 p. 1117-23. Smith, R. Smith T.M. 1998. Elements of ecology, fourth edition. Bennjamin/Cummings Publishing, Menlo Park, CA. Wilken, E. 1995. Assault of the earth. World Watch v. 8 p. 20-7. US News & World Report, 9/14/98. http.//www.usnews.soile.com. Dec. 2 1999. Yu, B. 1998. Rainfall erosivity and its estimation for Australia's tropics. Journal of Soil and Water Conservation v53 n2 p133 (8).
