Dark Shadows, Book 10 The Phantom and Barnabas Collins by Marilyn Ross The Phantom and Barnabas Collins by Marilyn Ross (Paperback Library, September 1969).
Dark Shadows, Book 18 Barnabas, Quentin and the Nightmare Assassin by Marilyn Ross Barnabas, Quentin and the Nightmare Assassin by Marilyn Ross (Paperback Library, June 1970).