25 years OCP: 1974-1999 = 25 ans OCP : 1974-1999

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World Health Organization & African Programme for Onchocerciasis Control. (1999). 25 years OCP: 1974-1999 = 25 ans OCP : 1974-1999. African Programme for Onchocerciasis Control. https://apps.who.int/iris/handle/10665/275602