"Great Soviet Encyclopedia (YUD)" is a significant work of Soviet encyclopedism, which made a significant contribution to the cultural heritage of the world community. The first edition was published in 1926, and the last - in 1990. The encyclopedia covered a wide range of subjects, covering science, technology, history, culture, geography and much more. The "Great Soviet Encyclopedia" was known for its detail, scope of knowledge and variety of information presented. Each article has been carefully processed and documented, allowing visitors to trust the reliability of the information. This encyclopedia became a model of quality in world scientific literature and was an important source of knowledge for a wide audience. The "Great Soviet Encyclopedia" remains a recognized source of information and a valuable legacy of the collective work of Soviet scientists and encyclopedists.