True Cases of Scotland Yard. Greenwich, Conn.: W.M. Messenger, 1937

True Cases of Scotland Yard. Greenwich, Conn.: W.M. Messenger, 1937, Volume: Gilbert D1105. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/527848 Accessed December 27, 2025.