"Great Soviet Encyclopedia (OD)" is a publication that has become a real treasure of knowledge about the universe. Completely compiled at the beginning of the 20th century, the encyclopedia was the largest of its kind in the world at the time. Each page of this encyclopedia is a deep pile of various fields of knowledge: history, culture, nature, technology, science, art. It contains thousands of articles, many illustrations, diagrams, tables. "Great Soviet Encyclopedia (OD)" remains a relevant source of information for a wide range of readers interested in history, science and culture. A work of time that has become a monument of world cultural development.