"Great Soviet Encyclopedia" (UB) is a large encyclopedic publication published in the Soviet Union in 1926-1990. In the first 30 volumes, a wide range of information was collected on various fields of knowledge - from history and geography to science and technology. Each volume provides comprehensive information on more than 1,000 articles that make up its structure. The UB encyclopedia became one of the important symbols of intellectual life in the Soviet Union and was popular with many readers not only in Soviet times, but also after its collapse.