Target Books were by far the dominant publisher of Doctor Who prose fiction and non-fiction from the 1970s to the early 1990s. They were most famous for their line of novelisations of Doctor Who serials, in part because the novelisations were the principle route by which some fans could experience missing episodes. Technically an imprint, and not an independent publisher, they were owned by several houses. However, the Doctor Who line is most associated with W.H. Allen & Co, who owned Target from 1977–1989, and Virgin Books, who bought them in 1990 and extended and reprinted the line until 1994.