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Further Reading offers additional information about your topics.

Rye (grain)
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. 
Grasses
Brown, Lauren. Grasses: An Identification Guide. Houghton Mifflin, 1992. Nontechnical approach to identification using color, shape, and plant texture.
Clark, Lynn G., and Richard W. Pohl. Agnes Chase's First Book of Grasses. Smithsonian, 1996. “The Structure of Grasses Explained for Beginners” (title page).
Darke, Rick, and Mark Griffiths, eds. Grasses. Timber, 1994. For the gardener, with information on plant cultivation, propagation, and culture, as well as descriptions.
Hitchcock, A. S., and Agnes Chase. Manual of the Grasses of the United States. Dover, 1971. Line drawings, identification keys, and descriptions to native and introduced grasses.
Holmes, W. Grass: Its Production and Utilization. Blackwell, 1988. 
Pohl, Richard W. How to Know the Grasses. W. C. Brown, 1978. Pictured keys for identification.

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