[The most important problems of preventive vaccination in the USSR].
Litvinov
S K
SK
D003140:Communicable Disease Control / Q000706:statistics & numerical data / Q000639:trends*; D006801:Humans; D007115:Immunization Schedule; D014586:USSR; D014611:Vaccination / Q000706:statistics & numerical data / Q000639:trends*; D014944:World Health Organization
Vazhneĭshie problemy vaktsinoprofilaktiki v SSSR.