USDA-NASS (U.S. Department of Agriculture–National Agricultural Statistics Service). 2001. Acreage. June 29. Cr Pr 2-5 (6-01). Washington, DC. Available online at http://usda.mannlib.cornell.edu/usda/nass/Acre//2000s/2001/Acre-06-29-2001.pdf. Accessed April 14, 2009.

———. 2003. Acreage. June 30. Cr Pr 2-5 (6-03). Washington, DC. Available online at http://usda.mannlib.cornell.edu/usda/nass/Acre//2000s/2003/Acre-06-30-2003.pdf. Accessed April 14, 2009.

———. 2005. Acreage. June 30. Cr Pr 2-5 (6-05). Washington, DC. Available online at http://usda.mannlib.cornell.edu/usda/nass/Acre//2000s/2005/Acre-06-30-2005.pdf. Accessed April 14, 2009.

———. 2007. Acreage. June 29. Cr Pr 2-5 (6-07). Washington, DC. Available online at http://usda.mannlib.cornell.edu/usda/nass/Acre//2000s/2007/Acre-06-29-2007.pdf. Accessed April 14, 2009.

———. 2008. Acreage. June 30. Cr Pr 2-5 (6-08). Washington, DC. Available online at http://usda.mannlib.cornell.edu/usda/current/Acre/Acre-06-30-2009.pdf. Accessed April 14, 2009.

———. 2009a. Quick stats (agricultural statistics database). Washington, DC. Available online at www.nass.usda.gov/Data_and_Statistics/index.asp. Accessed September 14, 2009.

———. 2009b. Acreage. June 30. Cr Pr 2-5 (6-09). Washington, DC. Available online at http://usda.mannlib.cornell.edu/usda/current/Acre/Acre-06-30-2009.pdf. Accessed November 24, 2009.

Vasil, I.K. 2008. A short history of plant biotechnology. Phytochemistry Reviews 7(3):387–394.

Vavilov, N.I. 1951. The origins, varieties, immunity and breeding of cultivated plants. Chronica Botanica 13:1–366.

Verhoog, H., M. Matze, E.L. van Bueren, and T. Baars. 2003. The role of the concept of the natural (naturalness) in organic farming. Journal of Agricultural and Environmental Ethics .16(1):29–49.

Vogt, D.U., and M. Parish. 2001. Food biotechnology in the United States: Science, regulation, and issues. RL30198. Congressional Research Service. Washington, DC. Available online at http://ncseonline.org/NLE/CRSreports/science/st-41.pdf. Accessed October 21, 2009.

Vos, T. 2000. Visions of the middle landscape: Organic farming and the politics of nature. Agriculture and Human Values 17(3):245–256.

Weise, E. 2007. Effects of genetically engineered alfalfa cultivate a debate. USA Today, February 15. p. 10D, Life section. Available online at http://www.usatoday.com/news/health/2007-02-14-alfalfa_x.htm. Accessed June 4, 2009.

Wiesbrook, M.L., W.G. Johnson, S.E. Hart, P.R. Bradley, and L.M. Wax. 2001. Comparison of weed management systems in narrow-row, glyphosate- and glufosinate-resistant soybean (Glycine max). Weed Technology 15(1):122–128.

Wilson, T.A., M.E. Rice, J.J. Tollefson, and C.D. Pilcher. 2005. Transgenic corn for control of the European corn borer and corn rootworms: A survey of midwestern farmers’ practices and perceptions. Journal of Economic Entomology 98(2):237–247.

Wisner, R. 2006. Potential market impacts from commercializing Round-Up Ready^® wheat. September. Western Organization of Resource Councils. Billings, MT. Available online at http://www.worc.org/userfiles/file/Wisner-Market%20Risks-Update-2006.pdf. Accessed July 5, 2009.

Wolf, S.A., D.R. Just, and D. Zilberman. 2001. Between data and decisions: The organization of agricultural economic information systems. Research Policy 30(1):121–141.

Wolfenbarger, L.L., and P.R. Phifer. 2000. The ecological risks and benefits of genetically engineered plants. Science 290(5499):2088–2093.