"Great Soviet Encyclopedia" (KE) is a publication that has become a real treasure of knowledge for readers in the Soviet Union. First published in 1926, 30 volumes of this outstanding encyclopedia were published between 1990 and 2010. It includes thousands of articles on various topics: from history and culture to science and technology. "Great Soviet Encyclopedia" was an important source of information for education and self-perception of Soviet society. By revealing various aspects of life and activity, this encyclopedia helped expand readers' horizons and understanding of the world around them.