"Big Soviet Encyclopedia" (CZ) is a publication that has become a real symbol of the Soviet period. With its scope and variety of knowledge, it impressed not only its volume, but also the quality of information. In Ukrainian, this encyclopedia was published in 30 volumes and contained many articles on history, culture, science, technology, geography and many other aspects of life. The "Great Soviet Encyclopedia" is not only a source of knowledge, but also a reflection of the ideology and views of that time. This is an extremely valuable historical document that helps to understand the spirit of that period and its specifics.