"Big Soviet Encyclopedia" or "YAM" is a publication that has become a real treasure for readers, covering various aspects of the life, culture and history of the Soviet Union. In its huge volumes, the encyclopedia contains the most relevant information from various fields of knowledge — from natural sciences and art to political realities and geography. Brightly laid out, saturated with photo materials, the "Great Soviet Encyclopedia" became not only a source of knowledge, but also a symbol of the ideology and worldview of the era of Soviet power, which was reflected in its every line.