Epidemiological and virological studies on the off-season smallpox cases in Calcutta / by J.K. Sarkar, S. Ray, and P. Manji
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Sarkar, J. K, Ray, S & Manji, P. (1970). Epidemiological and virological studies on the off-season smallpox cases in Calcutta / by J.K. Sarkar, S. Ray, and P. Manji. https://iris.who.int/handle/10665/67476
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WHO/SE/70.186 p.