Cooperation of socialist countries in the use of outer space

USSR. Moscow. October 16, 1969. Director of the Bulgarian Institute of Communications M. Velkov, Bulgarian academician Lyubomir Krystanov, Soviet academician Nikolai Nikolaevich Semenov and Soviet academician Boris Nikolaevich Petrov (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