Astronautical Research 1971: Proceedings of the 22nd Congress of the International Astronautical Federation Brussels, 20–25 September 1971 Editat de L.G. Napolitano et al. 9 dec 2011 Paperback Preț: 403.58 lei 6-8 săpt.
Astronautical Research 1972: Proceedings of the 23rd Congress of the International Astronautical Federation Vienna, 8–15 October 1972 Editat de L.G. Napolitano et al. 5 noi 2011 Paperback Preț: 389.76 lei 6-8 săpt.