86 · Unsolved: Alley Barber and the Thirty Thugs · Walter Shepherd · pz Mazes and Labyrinths: A Book of Puzzles (revised ed.), Walter Shephard, Dover 1961
130 · The Puzzle · Anon. · nv (r); Library of the Worlds Best Mystery and Detective Stories: English: Irish, ed. Julian Hawthorne, The Review of Reviews 1907