Space Activity Impact on Science and Technology: Proceedings of the XXIVth International Astronautical Congress, Baku, USSR, 7–13 October, 1973

Astronautical Research 1971: Proceedings of the 22nd Congress of the International Astronautical Federation Brussels, 20–25 September 1971

Astronautical Research 1972: Proceedings of the 23rd Congress of the International Astronautical Federation Vienna, 8–15 October 1972