[Sanitary-epidemiologic service of the USSR and ways of improving it].
D003140:Communicable Disease Control / Q000639:trends*; D004813:Epidemiology / Q000639:trends*; D006801:Humans; D012499:Sanitation / Q000639:trends*; D014586:USSR
Sanitarno-épidemiologicheskaia sluzhba strany i puti ee sovershenstvovaniia.