"Big Soviet Encyclopedia" is a huge and comprehensive book that has become a historical classic of the Soviet period. It is unique in its scale and volume, because at that time it contained a complete and detailed description of the world, science, culture, technology and much more. Its content included thousands of thematic articles, illustrations, maps and graphs. "Big Soviet Encyclopedia" became an important source of knowledge for citizens of the USSR and was used as a reference book in educational institutions. Its importance lies not only in factual material, but also in a peculiar worldview that reflected the ancient and unattainable idea of universal knowledge and education for all.