Cooperation of socialist countries in the use of outer space

USSR. Moscow. October 16, 1969. Bulgarian academician Lyubomir Krystanov, Soviet academician Nikolai Nikolaevich Semenov, Soviet academician Boris Nikolaevich Petrov and vice-president of the USSR Academy of Sciences academician Mikhail Dmitrievich Millionshchikov (from left to right in the background) during a meeting of the heads of coordinating bodies of socialist countries for cooperation in the field of exploration and use of outer space for peaceful purposes, which took place at the USSR Academy of Sciences. Alexey Stuzhin/TASS