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: 402.19 lei 43-57 zile
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: 388.44 lei 43-57 zile