This little booklet on spaceflight history is selling so well, to my surprise, that I decided it would be the first one that would be available not only in ebook formats ( http://www.xinxii.de/the-forgotten-astronauts-p-350121.html ) but also on paper ( http://www.amazon.co.uk/The-Forgotten-Astronauts-chapter-spaceflight/dp/149597362X/ref=sr_1_2/280-9050416-0862956?ie=UTF8&qid=1392997612&sr=8-2&keywords=The+Forgotten+Astronauts ).