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^R. E. Price and H. D. Brown (2000) A Century of Locust Control in South Africa. Ch 4. Workshop on Research Priorities for Migrant Pests of Agriculture in Southern Africa, Plant Protection Research Institute, Pretoria, South Africa, 24–26 March 1999. R. A. Cheke, L. J. Rosenberg and M. E. Kieser (eds) (2000) Natural Resources Institute, Chatham, UK.