I am an upright, bi-ped, carbon-based, life form. I come seeking information regarding the Signet (King Introduction) October 2003 paperback series of "The Dark Tower" novels. Specifically, I want to know if Signet has published "The Wolves of Calla", "The Song of Susannah", and "The Dark Tower" in that series. I just completed "Wizard and Glass" and would like to get "The Wolves of Calla" in the Signet series if it exists.