"Great Soviet Encyclopedia" (BA) is a huge and unique encyclopedia that was published in the period from 1926 to 1990. The uniqueness of the book lies in the fact that it contains extensive information from various fields of knowledge: from history, politics and culture to natural sciences and technical disciplines. The "Great Soviet Encyclopedia" includes more than 100 volumes and more than 200,000 articles, which makes it one of the largest and most authoritative reference books in the world. Each article in the encyclopedia contains reliable and detailed information, supplemented by illustrations, diagrams and tables. The reader will find in the encyclopedia "Big Soviet Encyclopedia" answers to almost any question that interests him, expand his knowledge in various fields and immerse himself in the world of great Soviet culture and science.