"Big Soviet Encyclopedia (Y-Ch)" is a huge everyday reference book covering a wide range of knowledge in various fields: history, culture, natural sciences, technology and much more. Published in 3 volumes in 1973, this encyclopedia is an extremely valuable source of information that reflects the scientific and cultural achievements of its time. It contains thousands of articles, illustrations, tables and diagrams that allow you to expand your horizons and deepen your knowledge of various fields of knowledge. "Great Soviet Encyclopedia (Y-Ch)" is an inexhaustible source of information and inspiration for those who value knowledge and wish to expand their worldview.