Further Reading

Boehlje M, Hofing S, and Christopher R (1999) Farming in the 21st

Century. West Lafayette, IN: Purdue University. Collinson M (ed.) (2000) A History of Farming Systems Research.

Wallingford, UK: CABI Publishing. FAO (2004) FAOSTAT Statistical Database.

Pimentel D, Hurd LE, Belloti AC, etal. (1973) Food production and the energy crisis. Science 182(No. 4111): 443-449. Turner BL, II (ed.) (1990) The Earth As Transformed by Human Action.

Cambridge: Cambridge University Press. USDA (2001) Agricultural statistics. Washington, DC: US Department of Agriculture.

USDA (2001) Food and Agricultural Policy: Taking Stock for the New

Century. Washington, DC: US Department of Agriculture. Wood S, Sebastian K, and Scherr S (2000) Pilot Analysis of Global Ecosystems: Agroecosystems. Washington, DC: World Resources Institute.

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