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Changes in weeding practices in the cotton-growing zone of Northern Cameroon. Martin José, Gaudard Lucien. 2001. In : Global weed problems: local and global solutions for the beginning of the century : proceedings of the third International weed science congress, Foz do Iguaçu, Brazil, June 6 to 11, 2000. IWSS. Oxford : IWSS, 12 p. International Weed Science Congress. 3, Foz do Iguaçu, Brésil, 6 Juin 2000/11 Juin 2000.