[The endemic nature of plague, causes of its spread and the control of plague epidemics].
D004813:Epidemiology / Q000266:history*; D049673:History, 20th Century; D010930:Plague / Q000266:history*; D012425:Russia (Pre-1917)
Endemichnost' chumy, prichiny ee rasprostraneniia i bor'ba s chumnymi épidemiiami.