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INTRODUCTION
Burke, I.C., Kittel, T.G.F., Lauenroth, W.K., Smook, P., Yonker, C.M. and Parton, W.J. 1991. Re-
gional analysis of the Central Great Plains. Bioscience 41, 685-692.
Dale, V.H. 1997. The relationship between land-use change and climate change. Ecological Applica-
tions 7, 753-769.
Gornitz, V. and NASA 1985. A survey of anthropogenic vegetation changes in west Africa during the
last century - climatic implications. Climatic Change 7, 285-325.
Haynes, C.V. Jr. 1982. Great Sand Sea and Selima Sand Sheet, eastern Sahara: geochronology of de-
sertifícation. Science 217, 629-633.
Holechek, J.L., Pieper, R.D. and Herbel, C.H. 1989. Range Management: Principles and Practices.
Prentice Hall, Endlewood Cliffs, New Jersey.
Illius, A.W. and O’Connor, T.G. 1999. When is grazing a major detriment of rangeland condition and
productivity? In: People and Rangelands: Building the Future (eds. Eldridge, D. and Freudenberger,
D.). Proceedings, VI International Rangeland Congress, Townsville, Australia, 419-424.
Mace, R. 1991. Overgrazing overstated. Nature 349, 280-281.
Owen, D.F. 1979. Drought and desertification in Africa: iessons from the Nairobi Conference. Oikos
33, 139-151.
Schlesinger, W.H., Reynolds, J.F., Cunningham, G.L., Huenneke, L.F., Jarrell, W.M., Virginia R.A.
and Whitford, W.G. 1990. Biological feedbacks in global desertification. Science 247, 1043-1048.
Stoddardt, L.A., Box, T.W. and Smith, A.D. 1975. Range Management. McGraw-Hill Book Com-
pany, New York, NY.
Turner, B.L., Moss, R.H. and Skole, D.L. (eds.) 1993. Relating land use and global landcover change:
a proposal for an IGBP-HDP Core Project. International Geosphere-Biosphere Report No. 24. Inter-
national Geosphere-Biosphere Programme, Stockholm.
Verstraete, M.M. 1986. Defining desertification: a review. Climatic Change 9, 5-18.
Vitousek, P.M. 1994. Beyond global warming: ecology and global change. Ecology 75, 1861-1876.