"Great Soviet Encyclopedia" (ZN) is a well-known reference book that was published in 1926 and ceased publication in 1990. It contained a wide range of information from various fields of knowledge, such as science, culture, history, technology and many others. The "Great Soviet Encyclopedia" was very popular among Soviet citizens as a source of knowledge about the world. The book contained more than 100,000 articles that revealed various aspects of the life and culture of Soviet society. Due to its volume and high quality of information, the Great Soviet Encyclopedia remains an important source for those studying the history and culture of the former Soviet Union.