The "Great Soviet Encyclopedia" is a large, multi-volume publication that is one of the most authoritative sources of knowledge about various aspects of life, science, culture and history of the former Soviet Union. The first edition of the encyclopedia was published in 1926, and the last volume was published in 1990. The "Great Soviet Encyclopedia" contains a huge amount of information related to various areas of knowledge - from the history of political regimes to the description of natural phenomena. This is an extremely valuable source for anyone interested in the history, culture and science of the former USSR.