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2. A. J. Biddle, C. M. Knott, and G. P. Gent (1988 ) The Pea Growing Handbook , Sixth Edition . Peterborough, England: Processors and Growers Research Organisation. 264 pp.
3. A. J. Gane, A. J. Biddle, C. M. Knott, and D. J. Eagle (1984 ) The Pea Growing Handbook , Peterborough, England: Processors and Growers Research Organisation. 242 pp.