"Great Soviet Encyclopedia" (BA) is an important publication that was published in 1926-1990 and included a wide list of knowledge from various fields of knowledge. The encyclopedia consists of numerous volumes and contains information about history, science, art, culture, geography and much more. For the reader, "BA" became an important source of knowledge and reference material that broadened horizons and provided an opportunity to find answers to various questions. This encyclopedia became one of the symbols of culture and education in Soviet times, and its importance remains relevant in the modern world as a source of unique information about the past.