text: There were twelve initial volumes released by Bantam, those being published between 1987 and 1993, before the series switched publishers, going to Baen, which released three new volumes between 1993 and 1995; then it was on to a third, ibooks Inc., which published two new volumes and also reprinted the first six, all between 2002 and 2006; then it was on to its fourth and current publisher, Tor in 2008, that continues the series and has issued four new volumes, with a new one likely forthcoming in summer 2014.