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Nutrient Disequilibria in Agroecosystems: Concepts and Case Studies: E.M.A. Smaling, O. Oenema, L.O. Fresco (Eds.); CABI Publishing, Wallingford, Oxon, UK, 1999, 336 pages, hardbound, ISBN 0 85199 268 4, UK £60.00 (US$110.00)
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Nutrient requirements of poultry: Ninth Revised Edition, Subcommittee on Poultry Nutrition, Committee on Animal Nutrition, Board on Agriculture, National Research Council, National Academy Press, Washington, DC, 1994, 155 pp., US$ 24.95, softcover, ISBN 0