Signing of the Decree to form the Tatarian ASSR, Painting from 1952, L. Fattakhov & Kh. Yakupov The Tatar Autonomous Soviet Socialist Republic was formed at the end of May, 1920. From The Great Soviet Encyclopedia in 1979 this is a comprehensive look at the republic, its geography, history, revolutionary tradition, language, arts and culture and economy. Tatar Autonomous Soviet Socialist Republic (Tatarstan Avtonomiyäle Sovet Sotsialistik Respublikasï), Tataria (Tatarstan), p