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Soybean
Botany guides
Cvancara, Alan M. Edible Wild Plants and Herbs: A Pocket Guide. McGraw-Hill Professional, 2001. A concise guide that will enable the reader to identify and use 50 common plants and herbs.
Darke, Rick. The Color Encyclopedia of Ornamental Grasses: Sedges, Rushes, Restios, Cat-Tails, and Selected Bamboos. Timber, 1999. An well-illustrated reference intended for gardeners in a wide range of situations and climates.
Foster, Steven, and James A. Duke. A Field Guide to Medicinal Plants: Eastern and Central North America. Houghton Mifflin, 1998. Identification of 500 medicinal plants with known uses, folk and scientifically verified.
Grantham, Keith, and Paul Klaassen. The Cacti and Other Succulents. Timber, 1999. A comprehensive A-Z guide.
Markley, Robert, and Elizabeth D. Crawford. Encyclopedia of Roses: History, Botany, Characteristics, Design Examples, Planting and Care, the Best Species and Varieties. Barron's Educational, 1999. A lavishly illustrated and comprehensive guide.
Turner, Nancy J., and Adam F. Szczawinski. Common Poisonous Plants and Mushrooms of North America. Lubrecht & Cramer, 1995. 
Venning, Frank D. Wildflowers of North America: A Guide to Field Identification. Golden, St. Martin's, 1984. 2001. An identification guide with descriptions, maps, and illustrations for more than 1,500 common species.
Crop Farming
Foster, Nelson, and Linda S. Cordell, eds. Chilies to Chocolate: Food the Americas Gave the World. University of Arizona Press, 1992. Biological and cultural history of the crops native to the Americas.
Lockhart, J. A. R., and A. J. L. Wiseman. Introduction to Crop Husbandry. Pergamon, 1988. Basic undergraduate text.
Peacock, James; Trevor Williams; and John H. Holden. Genes, Crops and the Environment. Cambridge University Press, 1993. Crop genetics and the need to conserve genetic diversity.
Rissler, Jane, and Margaret Mellon. The Ecological Risks of Engineered Crops. MIT Press, 1996. Potential problems with large-scale use of transgenic crops.
Smith, C. Wayne. Crop Production: Evolution, History, and Technology. Wiley, 1995. Discusses eight major crops in the United States with production practices, marketing, and history of commercial production.
Vaughan, John G., and Catherine Geissler. The New Oxford Book of Food Plants: A Guide to the Fruit, Vegetables, Herbs & Spices of the World. Oxford University Press, 1998. 
Zalon, Frank, and William Fry. Food Crop Pests and the Environment: The Need and Potential for Integrated Pest Management. American Phytopathological Society, 1992. 

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