The USSR census has been taken successfully (a conversation with A. A. Isupov, Chief of the All-Union Census Administration of the Central Statistical Administration of the USSR).
D019352:Censuses; D019049:Developed Countries; D011154:Population Characteristics; D012042:Registries; D012106:Research; D014586:USSR
Census; Developed Countries; Population Register; Population Statistics; Research Methodology; Ussr