1st manned flight in space 15th anniv. (4)

4k, Vostok, Salyut-Soyuz link-up. 6k, Meteor and Molniya Satellites, Orbita Ground Communications Center. 10k, Cosmonauts on board Salyut space station and Mars planetary station. 12k, Interkosmos station and Apollo-Soyuz linking.