Study on a world-wide programme against smallpox
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Assessment and evaluation of the national smallpox eradication programme in different parts of India : (to be presented to the WHO Expert Committee on Smallpox, Geneva - 14-20 January 1964) / by K.M. Lal Lal, K. M; World Health Organization. Expert Committee on Smallpox. Meeting (1964 : Geneva, Switzerland) (Smallpox/WP/26, 1964)