[The obligation to check up. (Review of socialistic competition in honor of Lenin's 6th jubilee)].
D049673:History, 20th Century; D014586:USSR; D014730:Veterinary Medicine / Q000266:history*
Obiazatel'stva na proverku. (Obzor sotsialisticheskogo sorevnovaniia v chest' Leninskogo iubileia)